diff --git a/font-src/derive-spacing.mjs b/font-src/derive-spacing.mjs
new file mode 100644
index 000000000..19be992f6
--- /dev/null
+++ b/font-src/derive-spacing.mjs
@@ -0,0 +1,80 @@
+import fs from "fs";
+
+import { FontIo, Ot } from "ot-builder";
+
+import { assignFontNames, createNamingDictFromArgv } from "./gen/meta/naming.mjs";
+
+export default main;
+
+async function main(argv) {
+	const font = await readTTF(argv);
+
+	const naming = createNamingDictFromArgv(argv);
+	assignFontNames(font, naming, false);
+
+	switch (argv.shape.spacing) {
+		case "term":
+			deriveTerm(font);
+			break;
+		case "fixed":
+			deriveTerm(font);
+			deriveFixed(font);
+			break;
+	}
+
+	await saveTTF(argv, font);
+}
+
+// To derive -Term variants, simply apply NWID
+function deriveTerm(font) {
+	const gsub = font.gsub;
+	let nwidMap = new Map();
+	for (const feature of gsub.features) {
+		if (feature.tag !== "NWID") continue;
+		for (const lookup of feature.lookups) {
+			if (!(lookup instanceof Ot.Gsub.Single)) continue;
+			for (const [from, to] of lookup.mapping) {
+				nwidMap.set(from, to);
+			}
+		}
+	}
+
+	for (const [ch, g] of [...font.cmap.unicode.entries()]) {
+		const narrow = nwidMap.get(g);
+		if (narrow) font.cmap.unicode.set(ch, narrow);
+	}
+	for (const [ch, vs, g] of [...font.cmap.vs.entries()]) {
+		const narrow = nwidMap.get(g);
+		if (narrow) font.cmap.vs.set(ch, vs, narrow);
+	}
+}
+
+// In FontConfig, a font is considered "monospace" if and only if all encoded non-combining
+// characters  (AW > 0) have the same width. We use this method to validate whether our
+// "Fixed" subfamilies are properly built.
+function deriveFixed(font) {
+	const unitWidth = font.os2.xAvgCharWidth;
+	for (const [ch, g] of [...font.cmap.unicode.entries()]) {
+		const advanceWidth = g.horizontal.end - g.horizontal.start;
+		if (!(advanceWidth === 0 || advanceWidth === unitWidth)) font.cmap.unicode.delete(ch);
+	}
+	for (const [ch, vs, g] of [...font.cmap.vs.entries()]) {
+		const advanceWidth = g.horizontal.end - g.horizontal.start;
+		if (!(advanceWidth === 0 || advanceWidth === unitWidth)) font.cmap.vs.delete(ch, vs);
+	}
+}
+
+async function readTTF(argv) {
+	const buf = await fs.promises.readFile(argv.i);
+	const sfnt = FontIo.readSfntOtf(buf);
+	const font = FontIo.readFont(sfnt, Ot.ListGlyphStoreFactory);
+	return font;
+}
+async function saveTTF(argv, font) {
+	const sfnt = FontIo.writeFont(font, {
+		glyphStore: { statOs2XAvgCharWidth: false },
+		generateDummyDigitalSignature: true
+	});
+	const buf = FontIo.writeSfntOtf(sfnt);
+	await fs.promises.writeFile(argv.o, buf);
+}
diff --git a/font-src/gen/build-font.mjs b/font-src/gen/build-font.mjs
index 3778e9d8e..7771ea7f3 100644
--- a/font-src/gen/build-font.mjs
+++ b/font-src/gen/build-font.mjs
@@ -1,20 +1,22 @@
 import { buildGlyphs } from "../glyphs/index.mjs";
 import { copyFontMetrics } from "../meta/aesthetics.mjs";
-import { assignFontNames } from "../meta/naming.mjs";
 import { buildOtl } from "../otl/index.mjs";
 
 import * as Caching from "./caching/index.mjs";
-import { CreateEmptyFont } from "./empty-font.mjs";
 import { finalizeFont } from "./finalize/index.mjs";
+import { CreateEmptyFont } from "./meta/empty-font.mjs";
+import { assignFontNames } from "./meta/naming.mjs";
 import { convertOtd } from "./otd-conv/index.mjs";
 
-("use strict");
 export async function buildFont(argv, para) {
-	const gs = buildGlyphs(para);
 	const baseFont = CreateEmptyFont(argv);
-	assignFontNames(para, baseFont);
+	assignFontNames(baseFont, para.naming, para.isQuasiProportional);
+
+	const gs = buildGlyphs(para);
 	copyFontMetrics(gs.fontMetrics, baseFont);
+
 	const otl = buildOtl(para, gs.glyphStore);
+
 	// Regulate
 	const excludeChars = new Set();
 	if (para.excludedCharRanges) {
diff --git a/font-src/gen/finalize/index.mjs b/font-src/gen/finalize/index.mjs
index af9ad1a92..a105bc508 100644
--- a/font-src/gen/finalize/index.mjs
+++ b/font-src/gen/finalize/index.mjs
@@ -15,9 +15,10 @@ function assignSubRank(glyphStore) {
 	let sr = 0;
 	for (const g of glyphStore.glyphs()) g.subRank = sr++;
 }
-// In FontConfig, a font is considered "monospace" if and only if all non-combining characters
-//  (AW > 0) have the same width. We use this method to validate whether our "Fixed" subfamilies
-//  are properly built.
+
+// In FontConfig, a font is considered "monospace" if and only if all encoded non-combining
+// characters (AW > 0) have the same width. We use this method to validate whether our
+// "Fixed" subfamilies are properly built.
 function validateMonospace(para, glyphStore) {
 	let awSet = new Set();
 	for (const [u, g] of glyphStore.encodedEntries()) {
diff --git a/font-src/gen/empty-font.mjs b/font-src/gen/meta/empty-font.mjs
similarity index 100%
rename from font-src/gen/empty-font.mjs
rename to font-src/gen/meta/empty-font.mjs
diff --git a/font-src/gen/meta/naming.mjs b/font-src/gen/meta/naming.mjs
new file mode 100644
index 000000000..d676ea3c2
--- /dev/null
+++ b/font-src/gen/meta/naming.mjs
@@ -0,0 +1,241 @@
+import { Ot } from "ot-builder";
+import semver from "semver";
+
+export function createNamingDictFromArgv(argv) {
+	return {
+		family: argv.menu.family,
+		version: argv.menu.version,
+		weight: argv.menu.weight - 0,
+		width: argv.menu.width - 0,
+		slope: argv.menu.slope
+	};
+}
+
+export function assignFontNames(font, naming, isQuasiProportional) {
+	// Clear existing names
+	font.name.records.length = 0;
+
+	// Preferred names
+	const family = naming.family.trim();
+	const style = getStyle(naming.weight, naming.width, naming.slope);
+
+	nameFont(font, Ot.Name.NameID.PreferredFamily, family);
+	nameFont(font, Ot.Name.NameID.PreferredSubfamily, style);
+	nameFont(font, Ot.Name.NameID.WwsFamily, family);
+	nameFont(font, Ot.Name.NameID.WwsSubfamily, style);
+
+	// Compat banes
+	const compat = getStyleLinkedStyles(naming.weight, naming.width, naming.slope);
+	let compatFamily = family;
+	if (compat.familySuffix !== " Regular") compatFamily = family + " " + compat.familySuffix;
+	if (compatFamily.length >= 31) compatFamily = family + " " + compat.familySuffixShort;
+
+	nameFont(font, Ot.Name.NameID.LegacyFamily, compatFamily);
+	nameFont(font, Ot.Name.NameID.LegacySubfamily, compat.style);
+
+	// Unique and Full name
+	const uniqueName = `${family} ${style} ${naming.version}`;
+	const fullName = style !== "Regular" ? `${family} ${style}` : family;
+	const postscriptName = fullName.replace(/ /g, "-");
+	nameFont(font, Ot.Name.NameID.UniqueFontId, uniqueName);
+	nameFont(font, Ot.Name.NameID.FullFontName, fullName);
+	nameFont(font, Ot.Name.NameID.PostscriptName, postscriptName);
+
+	// Weight, width and slope numbers
+	font.os2.usWeightClass = naming.weight;
+	font.os2.usWidthClass = naming.width;
+	font.os2.panose.bWeight = 1 + naming.weight / 100;
+	font.os2.sFamilyClass = 0x809;
+
+	// HEAD and OS/2 flags
+	const isItalic = naming.slope === "italic";
+	const isOblique = naming.slope === "oblique";
+	const isBold = naming.weight > 650;
+
+	// prettier-ignore
+	font.os2.fsSelection = accumulateFlags(
+		[Ot.Os2.FsSelection.OBLIQUE,          isOblique],
+		[Ot.Os2.FsSelection.BOLD,             isBold],
+		[Ot.Os2.FsSelection.ITALIC,           isItalic || isOblique],
+		[Ot.Os2.FsSelection.REGULAR,          !isBold && !isItalic && !isOblique],
+		[Ot.Os2.FsSelection.USE_TYPO_METRICS, true]
+	);
+
+	// prettier-ignore
+	font.head.macStyle = accumulateFlags(
+		[Ot.Head.MacStyle.Bold,               isBold],
+		[Ot.Head.MacStyle.Italic,             isItalic || isOblique],
+		[Ot.Head.MacStyle.Condensed,          naming.width < 5],
+		[Ot.Head.MacStyle.Extended,           naming.width > 5]
+	);
+
+	// Panose
+	font.os2.panose.bFamilyType = 2;
+	font.os2.panose.bContrast = 3;
+	font.os2.panose.bXHeight = 4;
+
+	// Pitch
+	if (!isQuasiProportional) {
+		font.os2.panose.bProportion = 9; // Monospaced
+		font.post.isFixedPitch = true;
+	} else {
+		font.os2.panose.bProportion = 0;
+		font.post.isFixedPitch = false;
+	}
+
+	// Licensing
+	if (naming.miscNames) {
+		nameFont(font, Ot.Name.NameID.Copyright, naming.miscNames.copyright);
+		nameFont(font, Ot.Name.NameID.Manufacturer, naming.miscNames.manufacturer);
+		nameFont(font, Ot.Name.NameID.Designer, naming.miscNames.designer);
+		nameFont(font, Ot.Name.NameID.Description, naming.miscNames.description);
+		nameFont(font, Ot.Name.NameID.LicenseDescription, naming.miscNames.licence);
+	}
+
+	// Version
+	nameFont(font, Ot.Name.NameID.VersionString, `Version ${naming.version}`);
+	const majorVersion = semver.major(naming.version);
+	const minorVersion = semver.minor(naming.version);
+	const patchVersion = semver.patch(naming.version);
+	if (minorVersion > 99 || patchVersion > 99) throw new RangeError("Version number overflow");
+	font.head.fontRevision = majorVersion + (minorVersion * 10 + patchVersion) / 1000;
+
+	// Misc
+	font.os2.ulCodePageRange1 = 0x2000011f;
+	font.os2.ulCodePageRange2 = 0xc4000000;
+	font.head.flags = accumulateFlags(
+		[Ot.Head.Flags.BaseLineYAt0, true],
+		[Ot.Head.Flags.LeftSidebearingAtX0, true],
+		[Ot.Head.Flags.InstructionsMayDependOnPointSize, true],
+		[Ot.Head.Flags.ForcePpemToBeInteger, true],
+		[Ot.Head.Flags.InstructionMayAlterAdvanceWidth, true]
+	);
+}
+
+function accumulateFlags(...entries) {
+	let s = 0;
+	for (const [flag, cond] of entries) {
+		if (cond) s |= flag;
+	}
+	return s;
+}
+
+function getStyleLinkedStyles(weight, width, slope) {
+	let linkWeight = weight;
+	let linkSlope = slope;
+	let nameSuffixWeight = 400;
+	let nameSuffixWidth = width;
+	let nameSuffixSlope = "normal";
+
+	if (!(linkWeight === 400 || linkWeight == 700)) {
+		nameSuffixWeight = linkWeight;
+		linkWeight = 400;
+	}
+
+	if (!(linkSlope === "normal" || linkSlope === "italic")) {
+		nameSuffixSlope = linkSlope;
+		linkSlope = "normal";
+	}
+
+	return {
+		style: getStyle(linkWeight, 5, linkSlope),
+		familySuffix: getStyle(nameSuffixWeight, nameSuffixWidth, nameSuffixSlope),
+		familySuffixShort: getShortStyle(nameSuffixWeight, nameSuffixWidth, nameSuffixSlope)
+	};
+}
+
+function nameFont(font, nameID, str) {
+	// Mac Roman
+	font.name.records.push({
+		platformID: 1,
+		encodingID: 0,
+		languageID: 0,
+		nameID,
+		value: Buffer.from(str, "utf-8")
+	});
+
+	// Windows Unicode English
+	font.name.records.push({
+		platformID: 3,
+		encodingID: 1,
+		languageID: 1033,
+		nameID,
+		value: str
+	});
+}
+
+function isRBIZ(weight, slope) {
+	return (weight === 400 || weight === 700) && (slope === "normal" || slope === "italic");
+}
+
+function getStyle(weight, width, slope) {
+	const weightPart = weightToMenuStyleMap[weight] ?? "W" + weight;
+	const widthPart = widthToMenuStyleMap[width] ?? "Wd" + width;
+	const slopePart = slopeToMenuStyleMap[slope] ?? "";
+	const rawName = weightPart + " " + widthPart + " " + slopePart;
+	return rawName.replace(/ +/g, " ").trim() || "Regular";
+}
+function getShortStyle(weight, width, slope) {
+	const weightPart = weightToMenuStyleMapShort[weight] ?? "W" + weight;
+	const widthPart = widthToMenuStyleMapShort[width] ?? "Wd" + width;
+	const slopePart = slopeToMenuStyleMapShort[slope] ?? "";
+	const rawName = weightPart + " " + widthPart + " " + slopePart;
+	return rawName.replace(/ +/g, " ").trim() || "Regular";
+}
+
+const weightToMenuStyleMap = {
+	100: "Thin",
+	200: "Extralight",
+	300: "Light",
+	400: "",
+	450: "Book",
+	500: "Medium",
+	600: "Semibold",
+	700: "Bold",
+	800: "Extrabold",
+	900: "Heavy"
+};
+const widthToMenuStyleMap = {
+	1: "Ultra-Condensed",
+	2: "Extra-Condensed",
+	3: "Condensed",
+	4: "Semi-Condensed",
+	5: "",
+	6: "Semi-Extended",
+	7: "Extended",
+	8: "Extra-Extended",
+	9: "Ultra-Extended"
+};
+const slopeToMenuStyleMap = {
+	normal: "",
+	italic: "Italic",
+	oblique: "Oblique"
+};
+const weightToMenuStyleMapShort = {
+	100: "Th",
+	200: "XLt",
+	300: "Lt",
+	400: "",
+	450: "Bk",
+	500: "Md",
+	600: "SmBd",
+	700: "Bd",
+	800: "XBd",
+	900: "Hv"
+};
+const widthToMenuStyleMapShort = {
+	1: "UltCn",
+	2: "XCn",
+	3: "Cn",
+	4: "SmCn",
+	5: "",
+	6: "SmEx",
+	7: "Ex",
+	8: "XEx",
+	9: "UltEx"
+};
+const slopeToMenuStyleMapShort = {
+	normal: "",
+	italic: "It",
+	oblique: "Obl"
+};
diff --git a/font-src/glyphs/symbol/punctuation/percentages.ptl b/font-src/glyphs/symbol/punctuation/percentages.ptl
index b18efe274..beed6a78d 100644
--- a/font-src/glyphs/symbol/punctuation/percentages.ptl
+++ b/font-src/glyphs/symbol/punctuation/percentages.ptl
@@ -9,8 +9,8 @@ glyph-block Symbol-Punctuation-Percentages : begin
 	glyph-block-import CommonShapes
 	glyph-block-import Common-Derivatives
 
-	define [NarrowUnicode u] : if (para.spacing <  1) u null
-	define [WideUnicode   u] : if (para.spacing >= 1) u null
+	define NarrowUnicode : NarrowUnicodeT WideWidth1
+	define WideUnicode   : WideUnicodeT   WideWidth1
 
 	define [PercentBarCor df sw] : HVContrast / [Math.sqrt (1 - [Math.pow ((df.rightSB - df.leftSB - sw) / (CAP - 0)) 2])]
 	define [PercentBarShape df sw] : begin
@@ -108,9 +108,6 @@ glyph-block Symbol-Punctuation-Percentages : begin
 		create-forked-glyph 'permille.WWID.ringsContinuousSlashAlsoConnected' : composite-proc [ConnnectedBar] [PerMilleProc]
 		create-forked-glyph 'basepoint.WWID.ringsContinuousSlashAlsoConnected' : composite-proc [ConnnectedBar] [BasePointProc]
 
-	select-variant 'permille.WWID' [WideUnicode 0x2030] (follow -- 'permille.WWID')
-	select-variant 'basepoint.WWID' [WideUnicode 0x2031] (follow -- 'permille.WWID')
-
 	create-glyph 'percent.ringsSegmentedSlash' : glyph-proc
 		set-width Width
 		local l   : SB / 2
@@ -191,4 +188,6 @@ glyph-block Symbol-Punctuation-Percentages : begin
 
 	select-variant 'percent' '%'
 	select-variant 'permille.NWID'  [NarrowUnicode 0x2030] (follow -- 'permille.NWID')
+	select-variant 'permille.WWID'  [WideUnicode   0x2030] (follow -- 'permille.WWID')
 	select-variant 'basepoint.NWID' [NarrowUnicode 0x2031] (follow -- 'permille.NWID')
+	select-variant 'basepoint.WWID' [WideUnicode   0x2031] (follow -- 'permille.WWID')
diff --git a/font-src/index.mjs b/font-src/index.mjs
index cdc22ef04..6991193da 100644
--- a/font-src/index.mjs
+++ b/font-src/index.mjs
@@ -8,6 +8,7 @@ import { encode } from "@msgpack/msgpack";
 import { FontIo } from "ot-builder";
 
 import { buildFont } from "./gen/build-font.mjs";
+import { createNamingDictFromArgv } from "./gen/meta/naming.mjs";
 import { createGrDisplaySheet } from "./support/gr.mjs";
 import { applyLigationData } from "./support/ligation-data.mjs";
 import { applyMetricOverride } from "./support/metric-override.mjs";
@@ -44,12 +45,8 @@ async function getParameters() {
 		if (argv.compatibilityLigatures) para.compLig = argv.compatibilityLigatures;
 		if (argv.metricOverride) applyMetricOverride(para, argv.metricOverride, argv);
 		para.naming = {
-			...para.naming,
-			family: argv.menu.family,
-			version: argv.menu.version,
-			weight: argv.menu.weight - 0,
-			width: argv.menu.width - 0,
-			slope: argv.menu.slope
+			miscNames: para.naming,
+			...createNamingDictFromArgv(argv)
 		};
 		return para;
 	}
diff --git a/font-src/meta/aesthetics.ptl b/font-src/meta/aesthetics.ptl
index 7dd72fb72..567cd0730 100644
--- a/font-src/meta/aesthetics.ptl
+++ b/font-src/meta/aesthetics.ptl
@@ -131,6 +131,9 @@ export : define [calculateMetrics para] : begin
 	define WideWidth3 : if (para.spacing >= 3) WideWidth0 Width
 	define WideWidth4 : if (para.spacing >= 4) WideWidth0 Width
 
+	define [NarrowUnicodeT wd] : function [u] : if (wd === Width) u null
+	define [WideUnicodeT   wd] : function [u] : if (wd !== Width) u null
+
 	define EssUpper : Stroke * [fallback para.essRatioUpper para.essRatio Contrast]
 	define EssLower : Stroke * [fallback para.essRatioLower para.essRatio Contrast]
 	define EssQuestion : Stroke * [fallback para.essRatioQuestion para.essRatio Contrast]
@@ -208,11 +211,12 @@ export : define [calculateMetrics para] : begin
 		AccentClearance AccentHeight CThin CThinB SLAB TailAdjX TailAdjY IBalance IBalance2
 		JBalance JBalance2 TBalance TBalance2 RBalance RBalance2 FBalance OneBalance WideWidth0
 		WideWidth1 WideWidth2 WideWidth3 WideWidth4 EssUpper EssLower EssQuestion HalfStroke
-		RightSB Middle DotRadius PeriodRadius SideJut ArchDepthA ArchDepthB SmallArchDepthA SmallArchDepthB CorrectionOMidX CorrectionOMidS ArchXAdjust compositeBaseAnchors
+		RightSB Middle DotRadius PeriodRadius SideJut ArchDepthA ArchDepthB SmallArchDepthA
+		SmallArchDepthB CorrectionOMidX CorrectionOMidS ArchXAdjust compositeBaseAnchors
 		AdviceStroke AdviceStroke2 OverlayStroke OperatorStroke GeometryStroke ShoulderFine
 		_SuperXY adviceSSmooth AdviceGlottalStopArchDepth shoulderMidSlope StrokeWidthBlend
 		ArchDepthAOf ArchDepthBOf SmoothAdjust MidJutSide MidJutCenter YSmoothMidR YSmoothMidL
-		HSwToV]
+		HSwToV NarrowUnicodeT WideUnicodeT]
 
 export : define [setFontMetrics para metrics fm] : begin
 	define [object CAP Descender XH Width SymbolMid] metrics
diff --git a/font-src/meta/macros.ptl b/font-src/meta/macros.ptl
index 06bba3c4c..c84553892 100644
--- a/font-src/meta/macros.ptl
+++ b/font-src/meta/macros.ptl
@@ -222,7 +222,7 @@ define-macro glyph-block : syntax-rules
 			AdviceStroke AdviceStroke2 OverlayStroke OperatorStroke GeometryStroke ShoulderFine
 			_SuperXY adviceSSmooth AdviceGlottalStopArchDepth shoulderMidSlope StrokeWidthBlend
 			ArchDepthAOf ArchDepthBOf SmoothAdjust MidJutSide MidJutCenter compositeBaseAnchors
-			YSmoothMidR YSmoothMidL HSwToV]
+			YSmoothMidR YSmoothMidL HSwToV NarrowUnicodeT WideUnicodeT]
 		define spiroFnImports `[g4 g2 corner flat curl close end straight widths
 			disable-contrast heading unimportant important alsoThru alsoThruThem bezControls
 			quadControls archv arcvh dispiro spiro-outline]
diff --git a/font-src/meta/naming.ptl b/font-src/meta/naming.ptl
deleted file mode 100644
index 5c5fd0e19..000000000
--- a/font-src/meta/naming.ptl
+++ /dev/null
@@ -1,227 +0,0 @@
-import semver from 'semver'
-import [Ot] from "ot-builder"
-extern Buffer
-
-import [fallback] from"../support/utils.mjs"
-
-define COPYRIGHT             0
-define FAMILY                1
-define STYLE                 2
-define UNIQUE_NAME           3
-define FULL_NAME             4
-define VERSION               5
-define POSTSCRIPT            6
-define TRADEMARK             7
-define MANUFACTURER          8
-define DESIGNER              9
-define DESCRIPTION          10
-define LICENCE              13
-define PREFERRED_FAMILY     16
-define PREFERRED_STYLE      17
-define WWS_PREFERRED_FAMILY 21
-define WWS_PREFERRED_STYLE  22
-
-define [nameFont font nameid str] : begin
-	font.name.records.push : object # Mac Roman
-		platformID  1
-		encodingID  0
-		languageID  0
-		nameID      nameid
-		value       : Buffer.from str 'utf-8'
-	font.name.records.push : object # Windows Unicode English
-		platformID  3
-		encodingID  1
-		languageID  1033
-		nameID      nameid
-		value       str
-
-define weightToMenuStyleMap : object
-	100 "Thin"
-	200 "Extralight"
-	300 "Light"
-	400 ""
-	450 "Book"
-	500 "Medium"
-	600 "Semibold"
-	700 "Bold"
-	800 "Extrabold"
-	900 "Heavy"
-define widthToMenuStyleMap : object
-	1 "Ultra-Condensed"
-	2 "Extra-Condensed"
-	3 "Condensed"
-	4 "Semi-Condensed"
-	5 ""
-	6 "Semi-Extended"
-	7 "Extended"
-	8 "Extra-Extended"
-	9 "Ultra-Extended"
-define slopeToMenuStyleMap : object
-	normal  ""
-	italic  "Italic"
-	oblique "Oblique"
-
-define weightToMenuStyleMapShort : object
-	100 "Th"
-	200 "XLt"
-	300 "Lt"
-	400 ""
-	450 "Bk"
-	500 "Md"
-	600 "SmBd"
-	700 "Bd"
-	800 "XBd"
-	900 "Hv"
-define widthToMenuStyleMapShort : object
-	1 "UltCn"
-	2 "XCn"
-	3 "Cn"
-	4 "SmCn"
-	5 ""
-	6 "SmEx"
-	7 "Ex"
-	8 "XEx"
-	9 "UltEx"
-define slopeToMenuStyleMapShort : object
-	normal  ""
-	italic  "It"
-	oblique "Obl"
-
-define [getStyle weight width slope] : begin
-	define weightPart : fallback weightToMenuStyleMap.(weight) ('W' + weight)
-	define widthPart  : fallback widthToMenuStyleMap.(width) ("Wd" + width)
-	define slopePart  : fallback slopeToMenuStyleMap.(slope) ''
-	define rawName    : weightPart + ' ' + widthPart + ' ' + slopePart
-	return : [[rawName.replace [regex ' +' 'g'] ' '].trim] || "Regular"
-
-define [getShortStyle weight width slope] : begin
-	define weightPart : fallback weightToMenuStyleMapShort.(weight) ('W' + weight)
-	define widthPart  : fallback widthToMenuStyleMapShort.(width) ("Wd" + width)
-	define slopePart  : fallback slopeToMenuStyleMapShort.(slope) ''
-	define rawName    : weightPart + ' ' + widthPart + ' ' + slopePart
-	return : [rawName.replace [regex ' ' 'g'] ''] || "Regular"
-
-define [isRBIBI weight slope] : (weight == 400 || weight == 700) && (slope == "normal" || slope == "italic")
-
-define [getStyleLinkedStyles weight width slope] : begin
-	local linkWeight       weight
-	local linkSlope        slope
-	local nameSuffixWeight 400
-	local nameSuffixWidth  width
-	local nameSuffixSlope  "normal"
-
-	# Not regular or bold
-	if (linkWeight != 400 && linkWeight != 700) : begin
-		nameSuffixWeight = linkWeight
-		linkWeight = 400
-
-	# Not "normal" or italic
-	if (linkSlope != "normal" && linkSlope != "italic") : begin
-		nameSuffixSlope = linkSlope
-		linkSlope = "normal"
-
-	return : list
-		getStyle linkWeight 5 linkSlope
-		getStyle nameSuffixWeight nameSuffixWidth nameSuffixSlope
-		getShortStyle nameSuffixWeight nameSuffixWidth nameSuffixSlope
-
-define [accumulate entries] : begin
-	local s 0
-	foreach { ev cond } [items-of entries] : begin
-		if cond : set s : s + ev
-	return s
-
-export : define [assignFontNames para font] : begin
-	# Preferred names
-	define family  : para.naming.family.trim
-	define style   : getStyle para.naming.weight para.naming.width para.naming.slope
-	define version : "Version " + para.naming.version
-
-	define isItalic  : para.naming.slope == "italic"
-	define isOblique : para.naming.slope == "oblique"
-	define isBold    : para.naming.weight > 650
-
-	nameFont font PREFERRED_FAMILY family # Preferred Family
-	nameFont font PREFERRED_STYLE style  # Preferred Style
-	nameFont font WWS_PREFERRED_FAMILY family # WWS Preferred Family
-	nameFont font WWS_PREFERRED_STYLE style  # WWS Preferred Style
-
-	# Compat names
-	local {compatStyle compatFamilySuffix shortCompatFamilySuffix} : getStyleLinkedStyles para.naming.weight para.naming.width para.naming.slope
-	local compatFamily family
-	if (compatFamilySuffix != "Regular") : set compatFamily : family + ' ' + compatFamilySuffix
-	if (compatFamily.length >= 31) : set compatFamily : family + ' ' + shortCompatFamilySuffix
-
-	nameFont font FAMILY compatFamily # Family
-	nameFont font STYLE compatStyle  # Style
-
-	nameFont font UNIQUE_NAME "\(family) \(style) \(version)" # Unique Name
-
-	local fontfullName : if (style != 'Regular') (family + ' ' + style) family
-	nameFont font FULL_NAME fontfullName # Full Name
-	nameFont font POSTSCRIPT : fontfullName.replace [regex ' ' 'g'] '-' # Postscript
-
-	# Misc names
-	nameFont font COPYRIGHT    para.naming.copyright    # Copyright
-	nameFont font MANUFACTURER para.naming.manufacturer # Manufacturer
-	nameFont font DESIGNER     para.naming.designer     # Designer
-	nameFont font DESCRIPTION  para.naming.description  # Description
-	nameFont font LICENCE      para.naming.licence      # Licence
-
-	# Weight, width and slope numbers
-	set font.os2.usWeightClass     para.naming.weight
-	set font.os2.usWidthClass      para.naming.width
-	set font.os2.panose.bWeight    : 1 + para.naming.weight / 100
-	set font.os2.sFamilyClass      : 8 * 0x100 + 9
-	set font.os2.xAvgCharWidth     : Math.round para.width
-
-	set font.os2.fsSelection : accumulate : list
-		list  Ot.Os2.FsSelection.OBLIQUE           isOblique
-		list  Ot.Os2.FsSelection.BOLD              isBold
-		list  Ot.Os2.FsSelection.ITALIC            (isItalic || isOblique)
-		list  Ot.Os2.FsSelection.REGULAR           (!isBold && !isItalic && !isOblique)
-		list  Ot.Os2.FsSelection.USE_TYPO_METRICS  true
-	set font.head.macStyle : accumulate : list
-		list  Ot.Head.MacStyle.Bold       isBold
-		list  Ot.Head.MacStyle.Italic     (isItalic || isOblique)
-		list  Ot.Head.MacStyle.Condensed  (para.naming.width < 5)
-		list  Ot.Head.MacStyle.Extended   (para.naming.width > 5)
-
-	# Version
-	nameFont font VERSION version # Version
-	define majorVersion : semver.major para.naming.version
-	define minorVersion : semver.minor para.naming.version
-	define patchVersion : semver.patch para.naming.version
-	if (minorVersion > 99 || patchVersion > 9) : throw : new Error "Version number overflow"
-	set font.head.fontRevision : majorVersion + (minorVersion * 10 + patchVersion) / 1000
-
-	# Panose
-	set font.os2.panose.bFamilyType      2
-	set font.os2.panose.bContrast        3
-	set font.os2.panose.bXHeight         4
-
-	# Pitch
-	if [not para.isQuasiProportional]
-	: then : begin
-		set font.os2.panose.bProportion  9 # Monospaced
-		set font.post.isFixedPitch       true
-	: else : begin
-		set font.os2.panose.bProportion  0
-		set font.post.isFixedPitch       false
-
-	# Misc
-	set font.os2.ulCodePageRange1  0x2000011f
-	set font.os2.ulCodePageRange2  0xc4000000
-	set font.head.flags : accumulate : list
-		list Ot.Head.Flags.BaseLineYAt0                      true
-		list Ot.Head.Flags.LeftSidebearingAtX0               true
-		list Ot.Head.Flags.InstructionsMayDependOnPointSize  true
-		list Ot.Head.Flags.ForcePpemToBeInteger              true
-		list Ot.Head.Flags.InstructionMayAlterAdvanceWidth   true
-
-	# Enforce the order of NAME table entries
-	font.name.records.sort : lambda [a b] : begin
-		if (a.platformID != b.platformID) : return : a.platformID - b.platformID
-		if (a.encodingID != b.encodingID) : return : a.encodingID - b.encodingID
-		if (a.languageID != b.languageID) : return : a.languageID - b.languageID
-		return : a.nameID - b.nameID
diff --git a/font-src/otl/index.ptl b/font-src/otl/index.ptl
index a52952d39..457114aba 100644
--- a/font-src/otl/index.ptl
+++ b/font-src/otl/index.ptl
@@ -21,15 +21,14 @@ define GDEF_MARK 3
 define [buildGSUB para glyphStore markGlyphs] : begin
 	define gsub : CreateEmptyTable
 
+	# NWID / WWID
+	buildGrFeature gsub glyphStore Gr.Nwid
+	buildGrFeature gsub glyphStore Gr.Wwid
+
 	# lnum / onum
 	buildGrFeature gsub glyphStore Gr.Lnum
 	buildGrFeature gsub glyphStore Gr.Onum
 
-	# NWID / WWID
-	if (!para.forceMonospace || para.spacing > 0) : begin
-		buildGrFeature gsub glyphStore Gr.Nwid
-		buildGrFeature gsub glyphStore Gr.Wwid
-
 	# APLF
 	buildGrFeature gsub glyphStore Gr.AplForm
 
diff --git a/package-lock.json b/package-lock.json
index 06974d41f..7cc2f02de 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "dependencies": {
         "@iarna/toml": "^2.2.5",
         "@msgpack/msgpack": "^2.7.2",
+        "deep-equal": "^2.0.5",
         "ot-builder": "^1.5.4",
         "otb-ttc-bundle": "^1.5.4",
         "semver": "^7.3.7",
@@ -789,6 +790,17 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/available-typed-arrays": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.5.tgz",
+      "integrity": "sha512-DMD0KiN46eipeziST1LPP/STfDU0sufISXmjSgvVsoU2tqxctQeASejWcfNtxYKqETM1UxQ8sp2OrSBWpHY6sw==",
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/balanced-match": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -821,7 +833,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
       "integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
-      "dev": true,
       "dependencies": {
         "function-bind": "^1.1.1",
         "get-intrinsic": "^1.0.2"
@@ -964,6 +975,31 @@
         }
       }
     },
+    "node_modules/deep-equal": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-2.0.5.tgz",
+      "integrity": "sha512-nPiRgmbAtm1a3JsnLCf6/SLfXcjyN5v8L1TXzdCmHrXJ4hx+gW/w1YCcn7z8gJtSiDArZCgYtbao3QqLm/N1Sw==",
+      "dependencies": {
+        "call-bind": "^1.0.0",
+        "es-get-iterator": "^1.1.1",
+        "get-intrinsic": "^1.0.1",
+        "is-arguments": "^1.0.4",
+        "is-date-object": "^1.0.2",
+        "is-regex": "^1.1.1",
+        "isarray": "^2.0.5",
+        "object-is": "^1.1.4",
+        "object-keys": "^1.1.1",
+        "object.assign": "^4.1.2",
+        "regexp.prototype.flags": "^1.3.0",
+        "side-channel": "^1.0.3",
+        "which-boxed-primitive": "^1.0.1",
+        "which-collection": "^1.0.1",
+        "which-typed-array": "^1.1.2"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/deep-is": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.4.tgz",
@@ -974,7 +1010,6 @@
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.4.tgz",
       "integrity": "sha512-uckOqKcfaVvtBdsVkdPv3XjveQJsNQqmhXgRi8uhvWWuPYZCNlzT8qAyblUgNoXdHdjMTzAqeGjAoli8f+bzPA==",
-      "dev": true,
       "dependencies": {
         "has-property-descriptors": "^1.0.0",
         "object-keys": "^1.1.1"
@@ -1020,7 +1055,6 @@
       "version": "1.20.1",
       "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.20.1.tgz",
       "integrity": "sha512-WEm2oBhfoI2sImeM4OF2zE2V3BYdSF+KnSi9Sidz51fQHd7+JuF8Xgcj9/0o+OWeIeIS/MiuNnlruQrJf16GQA==",
-      "dev": true,
       "dependencies": {
         "call-bind": "^1.0.2",
         "es-to-primitive": "^1.2.1",
@@ -1053,6 +1087,24 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/es-get-iterator": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/es-get-iterator/-/es-get-iterator-1.1.2.tgz",
+      "integrity": "sha512-+DTO8GYwbMCwbywjimwZMHp8AuYXOS2JZFWoi2AlPOS3ebnII9w/NLpNZtA7A0YLaVDw+O7KFCeoIV7OPvM7hQ==",
+      "dependencies": {
+        "call-bind": "^1.0.2",
+        "get-intrinsic": "^1.1.0",
+        "has-symbols": "^1.0.1",
+        "is-arguments": "^1.1.0",
+        "is-map": "^2.0.2",
+        "is-set": "^2.0.2",
+        "is-string": "^1.0.5",
+        "isarray": "^2.0.5"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/es-shim-unscopables": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/es-shim-unscopables/-/es-shim-unscopables-1.0.0.tgz",
@@ -1066,7 +1118,6 @@
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
       "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
-      "dev": true,
       "dependencies": {
         "is-callable": "^1.1.4",
         "is-date-object": "^1.0.1",
@@ -1782,6 +1833,14 @@
       "integrity": "sha512-0sQoMh9s0BYsm+12Huy/rkKxVu4R1+r96YX5cG44rHV0pQ6iC3Q+mkoMFaGWObMFYQxCVT+ssG1ksneA2MI9KQ==",
       "dev": true
     },
+    "node_modules/for-each": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/for-each/-/for-each-0.3.3.tgz",
+      "integrity": "sha512-jqYfLp7mo9vIyQf8ykW2v7A+2N4QjeCeI5+Dz9XraiO1ign81wjiH7Fb9vSOWvQfNtmSa4H2RoQTrrXivdUZmw==",
+      "dependencies": {
+        "is-callable": "^1.1.3"
+      }
+    },
     "node_modules/fs-extra": {
       "version": "10.1.0",
       "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-10.1.0.tgz",
@@ -1805,14 +1864,12 @@
     "node_modules/function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
-      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
-      "dev": true
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A=="
     },
     "node_modules/function.prototype.name": {
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/function.prototype.name/-/function.prototype.name-1.1.5.tgz",
       "integrity": "sha512-uN7m/BzVKQnCUF/iW8jYea67v++2u7m5UgENbHRtdDVclOUP+FMPlCNdmk0h/ysGyo2tavMJEDqJAkJdRa1vMA==",
-      "dev": true,
       "dependencies": {
         "call-bind": "^1.0.2",
         "define-properties": "^1.1.3",
@@ -1836,7 +1893,6 @@
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/functions-have-names/-/functions-have-names-1.2.3.tgz",
       "integrity": "sha512-xckBUXyTIqT97tq2x2AMb+g163b5JFysYk0x4qxNFwbfQkmNZoiRHb6sPzI9/QV33WeuvVYBUIiD4NzNIyqaRQ==",
-      "dev": true,
       "funding": {
         "url": "https://github.com/sponsors/ljharb"
       }
@@ -1854,7 +1910,6 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.2.tgz",
       "integrity": "sha512-Jfm3OyCxHh9DJyc28qGk+JmfkpO41A4XkneDSujN9MDXrm4oDKdHvndhZ2dN94+ERNfkYJWDclW6k2L/ZGHjXA==",
-      "dev": true,
       "dependencies": {
         "function-bind": "^1.1.1",
         "has": "^1.0.3",
@@ -1868,7 +1923,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/get-symbol-description/-/get-symbol-description-1.0.0.tgz",
       "integrity": "sha512-2EmdH1YvIQiZpltCNgkuiUnyukzxM/R6NDJX31Ke3BG1Nq5b0S2PhX59UKi9vZpPDQVdqn+1IcaAwnzTT5vCjw==",
-      "dev": true,
       "dependencies": {
         "call-bind": "^1.0.2",
         "get-intrinsic": "^1.1.1"
@@ -1963,7 +2017,6 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
       "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
-      "dev": true,
       "dependencies": {
         "function-bind": "^1.1.1"
       },
@@ -1975,7 +2028,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/has-bigints/-/has-bigints-1.0.2.tgz",
       "integrity": "sha512-tSvCKtBr9lkF0Ex0aQiP9N+OpV4zi2r/Nee5VkRDbaqv35RLYMzbwQfFSZZH0kR+Rd6302UJZ2p/bJCEoR3VoQ==",
-      "dev": true,
       "funding": {
         "url": "https://github.com/sponsors/ljharb"
       }
@@ -1992,7 +2044,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-property-descriptors/-/has-property-descriptors-1.0.0.tgz",
       "integrity": "sha512-62DVLZGoiEBDHQyqG4w9xCuZ7eJEwNmJRWw2VY84Oedb7WFcA27fiEVe8oUQx9hAUJ4ekurquucTGwsyO1XGdQ==",
-      "dev": true,
       "dependencies": {
         "get-intrinsic": "^1.1.1"
       },
@@ -2004,7 +2055,6 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.3.tgz",
       "integrity": "sha512-l3LCuF6MgDNwTDKkdYGEihYjt5pRPbEg46rtlmnSPlUbgmB8LOIrKJbYYFBSbnPaJexMKtiPO8hmeRjRz2Td+A==",
-      "dev": true,
       "engines": {
         "node": ">= 0.4"
       },
@@ -2016,7 +2066,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.0.tgz",
       "integrity": "sha512-kFjcSNhnlGV1kyoGk7OXKSawH5JOb/LzUc5w9B02hOTO0dfFRjbHQKvg1d6cf3HbeUmtU9VbbV3qzZ2Teh97WQ==",
-      "dev": true,
       "dependencies": {
         "has-symbols": "^1.0.2"
       },
@@ -2104,7 +2153,6 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/internal-slot/-/internal-slot-1.0.3.tgz",
       "integrity": "sha512-O0DB1JC/sPyZl7cIo78n5dR7eUSwwpYPiXRhTzNxZVAMUuB8vlnRFyLxdrVToks6XPLVnFfbzaVd5WLjhgg+vA==",
-      "dev": true,
       "dependencies": {
         "get-intrinsic": "^1.1.0",
         "has": "^1.0.3",
@@ -2114,11 +2162,25 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/is-arguments": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/is-arguments/-/is-arguments-1.1.1.tgz",
+      "integrity": "sha512-8Q7EARjzEnKpt/PCD7e1cgUS0a6X8u5tdSiMqXhojOdoV9TsMsiO+9VLC5vAmO8N7/GmXn7yjR8qnA6bVAEzfA==",
+      "dependencies": {
+        "call-bind": "^1.0.2",
+        "has-tostringtag": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/is-bigint": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/is-bigint/-/is-bigint-1.0.4.tgz",
       "integrity": "sha512-zB9CruMamjym81i2JZ3UMn54PKGsQzsJeo6xvN3HJJ4CAsQNB6iRutp2To77OfCNuoxspsIhzaPoO1zyCEhFOg==",
-      "dev": true,
       "dependencies": {
         "has-bigints": "^1.0.1"
       },
@@ -2130,7 +2192,6 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/is-boolean-object/-/is-boolean-object-1.1.2.tgz",
       "integrity": "sha512-gDYaKHJmnj4aWxyj6YHyXVpdQawtVLHU5cb+eztPGczf6cjuTdwve5ZIEfgXqH4e57An1D1AKf8CZ3kYrQRqYA==",
-      "dev": true,
       "dependencies": {
         "call-bind": "^1.0.2",
         "has-tostringtag": "^1.0.0"
@@ -2146,7 +2207,6 @@
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.2.4.tgz",
       "integrity": "sha512-nsuwtxZfMX67Oryl9LCQ+upnC0Z0BgpwntpS89m1H/TLF0zNfzfLMV/9Wa/6MZsj0acpEjAO0KF1xT6ZdLl95w==",
-      "dev": true,
       "engines": {
         "node": ">= 0.4"
       },
@@ -2170,7 +2230,6 @@
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.5.tgz",
       "integrity": "sha512-9YQaSxsAiSwcvS33MBk3wTCVnWK+HhF8VZR2jRxehM16QcVOdHqPn4VPHmRK4lSr38n9JriurInLcP90xsYNfQ==",
-      "dev": true,
       "dependencies": {
         "has-tostringtag": "^1.0.0"
       },
@@ -2211,11 +2270,18 @@
         "node": ">=0.10.0"
       }
     },
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       "integrity": "sha512-Jfm3OyCxHh9DJyc28qGk+JmfkpO41A4XkneDSujN9MDXrm4oDKdHvndhZ2dN94+ERNfkYJWDclW6k2L/ZGHjXA==",
-      "dev": true,
       "requires": {
         "function-bind": "^1.1.1",
         "has": "^1.0.3",
@@ -5072,7 +5264,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/get-symbol-description/-/get-symbol-description-1.0.0.tgz",
       "integrity": "sha512-2EmdH1YvIQiZpltCNgkuiUnyukzxM/R6NDJX31Ke3BG1Nq5b0S2PhX59UKi9vZpPDQVdqn+1IcaAwnzTT5vCjw==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "get-intrinsic": "^1.1.1"
@@ -5140,7 +5331,6 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
       "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
-      "dev": true,
       "requires": {
         "function-bind": "^1.1.1"
       }
@@ -5148,8 +5338,7 @@
     "has-bigints": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/has-bigints/-/has-bigints-1.0.2.tgz",
-      "integrity": "sha512-tSvCKtBr9lkF0Ex0aQiP9N+OpV4zi2r/Nee5VkRDbaqv35RLYMzbwQfFSZZH0kR+Rd6302UJZ2p/bJCEoR3VoQ==",
-      "dev": true
+      "integrity": "sha512-tSvCKtBr9lkF0Ex0aQiP9N+OpV4zi2r/Nee5VkRDbaqv35RLYMzbwQfFSZZH0kR+Rd6302UJZ2p/bJCEoR3VoQ=="
     },
     "has-flag": {
       "version": "4.0.0",
@@ -5160,7 +5349,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-property-descriptors/-/has-property-descriptors-1.0.0.tgz",
       "integrity": "sha512-62DVLZGoiEBDHQyqG4w9xCuZ7eJEwNmJRWw2VY84Oedb7WFcA27fiEVe8oUQx9hAUJ4ekurquucTGwsyO1XGdQ==",
-      "dev": true,
       "requires": {
         "get-intrinsic": "^1.1.1"
       }
@@ -5168,14 +5356,12 @@
     "has-symbols": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.3.tgz",
-      "integrity": "sha512-l3LCuF6MgDNwTDKkdYGEihYjt5pRPbEg46rtlmnSPlUbgmB8LOIrKJbYYFBSbnPaJexMKtiPO8hmeRjRz2Td+A==",
-      "dev": true
+      "integrity": "sha512-l3LCuF6MgDNwTDKkdYGEihYjt5pRPbEg46rtlmnSPlUbgmB8LOIrKJbYYFBSbnPaJexMKtiPO8hmeRjRz2Td+A=="
     },
     "has-tostringtag": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.0.tgz",
       "integrity": "sha512-kFjcSNhnlGV1kyoGk7OXKSawH5JOb/LzUc5w9B02hOTO0dfFRjbHQKvg1d6cf3HbeUmtU9VbbV3qzZ2Teh97WQ==",
-      "dev": true,
       "requires": {
         "has-symbols": "^1.0.2"
       }
@@ -5239,18 +5425,25 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/internal-slot/-/internal-slot-1.0.3.tgz",
       "integrity": "sha512-O0DB1JC/sPyZl7cIo78n5dR7eUSwwpYPiXRhTzNxZVAMUuB8vlnRFyLxdrVToks6XPLVnFfbzaVd5WLjhgg+vA==",
-      "dev": true,
       "requires": {
         "get-intrinsic": "^1.1.0",
         "has": "^1.0.3",
         "side-channel": "^1.0.4"
       }
     },
+    "is-arguments": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/is-arguments/-/is-arguments-1.1.1.tgz",
+      "integrity": "sha512-8Q7EARjzEnKpt/PCD7e1cgUS0a6X8u5tdSiMqXhojOdoV9TsMsiO+9VLC5vAmO8N7/GmXn7yjR8qnA6bVAEzfA==",
+      "requires": {
+        "call-bind": "^1.0.2",
+        "has-tostringtag": "^1.0.0"
+      }
+    },
     "is-bigint": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/is-bigint/-/is-bigint-1.0.4.tgz",
       "integrity": "sha512-zB9CruMamjym81i2JZ3UMn54PKGsQzsJeo6xvN3HJJ4CAsQNB6iRutp2To77OfCNuoxspsIhzaPoO1zyCEhFOg==",
-      "dev": true,
       "requires": {
         "has-bigints": "^1.0.1"
       }
@@ -5259,7 +5452,6 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/is-boolean-object/-/is-boolean-object-1.1.2.tgz",
       "integrity": "sha512-gDYaKHJmnj4aWxyj6YHyXVpdQawtVLHU5cb+eztPGczf6cjuTdwve5ZIEfgXqH4e57An1D1AKf8CZ3kYrQRqYA==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "has-tostringtag": "^1.0.0"
@@ -5268,8 +5460,7 @@
     "is-callable": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.2.4.tgz",
-      "integrity": "sha512-nsuwtxZfMX67Oryl9LCQ+upnC0Z0BgpwntpS89m1H/TLF0zNfzfLMV/9Wa/6MZsj0acpEjAO0KF1xT6ZdLl95w==",
-      "dev": true
+      "integrity": "sha512-nsuwtxZfMX67Oryl9LCQ+upnC0Z0BgpwntpS89m1H/TLF0zNfzfLMV/9Wa/6MZsj0acpEjAO0KF1xT6ZdLl95w=="
     },
     "is-core-module": {
       "version": "2.10.0",
@@ -5284,7 +5475,6 @@
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.5.tgz",
       "integrity": "sha512-9YQaSxsAiSwcvS33MBk3wTCVnWK+HhF8VZR2jRxehM16QcVOdHqPn4VPHmRK4lSr38n9JriurInLcP90xsYNfQ==",
-      "dev": true,
       "requires": {
         "has-tostringtag": "^1.0.0"
       }
@@ -5310,11 +5500,15 @@
         "is-extglob": "^2.1.1"
       }
     },
+    "is-map": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/is-map/-/is-map-2.0.2.tgz",
+      "integrity": "sha512-cOZFQQozTha1f4MxLFzlgKYPTyj26picdZTx82hbc/Xf4K/tZOOXSCkMvU4pKioRXGDLJRn0GM7Upe7kR721yg=="
+    },
     "is-negative-zero": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/is-negative-zero/-/is-negative-zero-2.0.2.tgz",
-      "integrity": "sha512-dqJvarLawXsFbNDeJW7zAz8ItJ9cd28YufuuFzh0G8pNHjJMnY08Dv7sYX2uF5UpQOwieAeOExEYAWWfu7ZZUA==",
-      "dev": true
+      "integrity": "sha512-dqJvarLawXsFbNDeJW7zAz8ItJ9cd28YufuuFzh0G8pNHjJMnY08Dv7sYX2uF5UpQOwieAeOExEYAWWfu7ZZUA=="
     },
     "is-number": {
       "version": "7.0.0",
@@ -5326,7 +5520,6 @@
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/is-number-object/-/is-number-object-1.0.7.tgz",
       "integrity": "sha512-k1U0IRzLMo7ZlYIfzRu23Oh6MiIFasgpb9X76eqfFZAqwH44UI4KTBvBYIZ1dSL9ZzChTB9ShHfLkR4pdW5krQ==",
-      "dev": true,
       "requires": {
         "has-tostringtag": "^1.0.0"
       }
@@ -5335,17 +5528,20 @@
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.1.4.tgz",
       "integrity": "sha512-kvRdxDsxZjhzUX07ZnLydzS1TU/TJlTUHHY4YLL87e37oUA49DfkLqgy+VjFocowy29cKvcSiu+kIv728jTTVg==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "has-tostringtag": "^1.0.0"
       }
     },
+    "is-set": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/is-set/-/is-set-2.0.2.tgz",
+      "integrity": "sha512-+2cnTEZeY5z/iXGbLhPrOAaK/Mau5k5eXq9j14CpRTftq0pAJu2MwVRSZhyZWBzx3o6X795Lz6Bpb6R0GKf37g=="
+    },
     "is-shared-array-buffer": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-shared-array-buffer/-/is-shared-array-buffer-1.0.2.tgz",
       "integrity": "sha512-sqN2UDu1/0y6uvXyStCOzyhAjCSlHceFoMKJW8W9EU9cvic/QdsZ0kEU93HEy3IUEFZIiH/3w+AH/UQbPHNdhA==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2"
       }
@@ -5354,7 +5550,6 @@
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/is-string/-/is-string-1.0.7.tgz",
       "integrity": "sha512-tE2UXzivje6ofPW7l23cjDOMa09gb7xlAqG6jG5ej6uPV32TlWP3NKPigtaGeHNu9fohccRYvIiZMfOOnOYUtg==",
-      "dev": true,
       "requires": {
         "has-tostringtag": "^1.0.0"
       }
@@ -5363,20 +5558,49 @@
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/is-symbol/-/is-symbol-1.0.4.tgz",
       "integrity": "sha512-C/CPBqKWnvdcxqIARxyOh4v1UUEOCHpgDa0WYgpKDFMszcrPcffg5uhwSgPCLD2WWxmq6isisz87tzT01tuGhg==",
-      "dev": true,
       "requires": {
         "has-symbols": "^1.0.2"
       }
     },
+    "is-typed-array": {
+      "version": "1.1.9",
+      "resolved": "https://registry.npmjs.org/is-typed-array/-/is-typed-array-1.1.9.tgz",
+      "integrity": "sha512-kfrlnTTn8pZkfpJMUgYD7YZ3qzeJgWUn8XfVYBARc4wnmNOmLbmuuaAs3q5fvB0UJOn6yHAKaGTPM7d6ezoD/A==",
+      "requires": {
+        "available-typed-arrays": "^1.0.5",
+        "call-bind": "^1.0.2",
+        "es-abstract": "^1.20.0",
+        "for-each": "^0.3.3",
+        "has-tostringtag": "^1.0.0"
+      }
+    },
+    "is-weakmap": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/is-weakmap/-/is-weakmap-2.0.1.tgz",
+      "integrity": "sha512-NSBR4kH5oVj1Uwvv970ruUkCV7O1mzgVFO4/rev2cLRda9Tm9HrL70ZPut4rOHgY0FNrUu9BCbXA2sdQ+x0chA=="
+    },
     "is-weakref": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-weakref/-/is-weakref-1.0.2.tgz",
       "integrity": "sha512-qctsuLZmIQ0+vSSMfoVvyFe2+GSEvnmZ2ezTup1SBse9+twCCeial6EEi3Nc2KFcf6+qz2FBPnjXsk8xhKSaPQ==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2"
       }
     },
+    "is-weakset": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/is-weakset/-/is-weakset-2.0.2.tgz",
+      "integrity": "sha512-t2yVvttHkQktwnNNmBQ98AhENLdPUTDTE21uPqAQ0ARwQfGeQKRVS0NNurH7bTf7RrvcVn1OOge45CnBeHCSmg==",
+      "requires": {
+        "call-bind": "^1.0.2",
+        "get-intrinsic": "^1.1.1"
+      }
+    },
+    "isarray": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.5.tgz",
+      "integrity": "sha512-xHjhDr3cNBK0BzdUJSPXZntQUx/mwMS5Rw4A7lPJ90XGAO6ISP/ePDNuo0vhqOZU+UD5JoodwCAAoZQd3FeAKw=="
+    },
     "isexe": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
@@ -5516,20 +5740,26 @@
     "object-inspect": {
       "version": "1.12.2",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.12.2.tgz",
-      "integrity": "sha512-z+cPxW0QGUp0mcqcsgQyLVRDoXFQbXOwBaqyF7VIgI4TWNQsDHrBpUQslRmIfAoYWdYzs6UlKJtB2XJpTaNSpQ==",
-      "dev": true
+      "integrity": "sha512-z+cPxW0QGUp0mcqcsgQyLVRDoXFQbXOwBaqyF7VIgI4TWNQsDHrBpUQslRmIfAoYWdYzs6UlKJtB2XJpTaNSpQ=="
+    },
+    "object-is": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/object-is/-/object-is-1.1.5.tgz",
+      "integrity": "sha512-3cyDsyHgtmi7I7DfSSI2LDp6SK2lwvtbg0p0R1e0RvTqF5ceGx+K2dfSjm1bKDMVCFEDAQvy+o8c6a7VujOddw==",
+      "requires": {
+        "call-bind": "^1.0.2",
+        "define-properties": "^1.1.3"
+      }
     },
     "object-keys": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
-      "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==",
-      "dev": true
+      "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA=="
     },
     "object.assign": {
       "version": "4.1.3",
       "resolved": "https://registry.npmjs.org/object.assign/-/object.assign-4.1.3.tgz",
       "integrity": "sha512-ZFJnX3zltyjcYJL0RoCJuzb+11zWGyaDbjgxZbdV7rFEcHQuYxrZqhow67aA7xpes6LhojyFDaBKAFfogQrikA==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "define-properties": "^1.1.4",
@@ -5770,7 +6000,6 @@
       "version": "1.4.3",
       "resolved": "https://registry.npmjs.org/regexp.prototype.flags/-/regexp.prototype.flags-1.4.3.tgz",
       "integrity": "sha512-fjggEOO3slI6Wvgjwflkc4NFRCTZAu5CnNfBd5qOMYhWdn67nJBBu34/TkD++eeFmd8C9r9jfXJ27+nSiRkSUA==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "define-properties": "^1.1.3",
@@ -5907,7 +6136,6 @@
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
       "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.0",
         "get-intrinsic": "^1.0.2",
@@ -5956,7 +6184,6 @@
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/string.prototype.trimend/-/string.prototype.trimend-1.0.5.tgz",
       "integrity": "sha512-I7RGvmjV4pJ7O3kdf+LXFpVfdNOxtCW/2C8f6jNiW4+PQchwxkCDzlk1/7p+Wl4bqFIZeF47qAHXLuHHWKAxog==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "define-properties": "^1.1.4",
@@ -5967,7 +6194,6 @@
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/string.prototype.trimstart/-/string.prototype.trimstart-1.0.5.tgz",
       "integrity": "sha512-THx16TJCGlsN0o6dl2o6ncWUsdgnLRSA23rRE5pyGBw/mLr3Ej/R2LaqCtgP8VNMGZsvMWnf9ooZPyY2bHvUFg==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "define-properties": "^1.1.4",
@@ -6086,7 +6312,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.2.tgz",
       "integrity": "sha512-61pPlCD9h51VoreyJ0BReideM3MDKMKnh6+V9L08331ipq6Q8OFXZYiqP6n/tbHx4s5I9uRhcye6BrbkizkBDw==",
-      "dev": true,
       "requires": {
         "call-bind": "^1.0.2",
         "has-bigints": "^1.0.2",
@@ -6186,7 +6411,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz",
       "integrity": "sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==",
-      "dev": true,
       "requires": {
         "is-bigint": "^1.0.1",
         "is-boolean-object": "^1.1.0",
@@ -6195,6 +6419,30 @@
         "is-symbol": "^1.0.3"
       }
     },
+    "which-collection": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/which-collection/-/which-collection-1.0.1.tgz",
+      "integrity": "sha512-W8xeTUwaln8i3K/cY1nGXzdnVZlidBcagyNFtBdD5kxnb4TvGKR7FfSIS3mYpwWS1QUCutfKz8IY8RjftB0+1A==",
+      "requires": {
+        "is-map": "^2.0.1",
+        "is-set": "^2.0.1",
+        "is-weakmap": "^2.0.1",
+        "is-weakset": "^2.0.1"
+      }
+    },
+    "which-typed-array": {
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.8.tgz",
+      "integrity": "sha512-Jn4e5PItbcAHyLoRDwvPj1ypu27DJbtdYXUa5zsinrUx77Uvfb0cXwwnGMTn7cjUfhhqgVQnVJCwF+7cgU7tpw==",
+      "requires": {
+        "available-typed-arrays": "^1.0.5",
+        "call-bind": "^1.0.2",
+        "es-abstract": "^1.20.0",
+        "for-each": "^0.3.3",
+        "has-tostringtag": "^1.0.0",
+        "is-typed-array": "^1.1.9"
+      }
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
diff --git a/package.json b/package.json
index 520100e28..f8e836eba 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,8 @@
     "toposort": "^2.0.2",
     "typo-geom": "^0.12.1",
     "uuid": "^8.3.2",
-    "wawoff2": "^2.0.1"
+    "wawoff2": "^2.0.1",
+    "deep-equal": "^2.0.5"
   },
   "devDependencies": {
     "@unicode/unicode-14.0.0": "^1.3.0",
@@ -33,4 +34,4 @@
   "engines": {
     "node": ">=16.0.0"
   }
-}
+}
\ No newline at end of file
diff --git a/verdafile.mjs b/verdafile.mjs
index e947621ce..71069c0e8 100644
--- a/verdafile.mjs
+++ b/verdafile.mjs
@@ -2,6 +2,7 @@ import * as FS from "fs";
 import * as Path from "path";
 
 import * as toml from "@iarna/toml";
+import deepEqual from "deep-equal";
 import semver from "semver";
 import * as uuid from "uuid";
 import * as Verda from "verda";
@@ -148,9 +149,37 @@ const BuildPlans = computed("metadata:build-plans", async target => {
 		}
 		returnBuildPlans[prefix] = bp;
 	}
+	linkSpacingDerivableBuildPlans(returnBuildPlans);
 	return { fileNameToBpMap, buildPlans: returnBuildPlans };
 });
 
+function linkSpacingDerivableBuildPlans(bps) {
+	for (const pfxTo in bps) {
+		const planTo = bps[pfxTo];
+		const planToVal = rectifyPlanForSpacingDerivation(planTo);
+		if (!(planTo.spacing === "term" || planTo.spacing === "fixed")) continue;
+		for (const pfxFrom in bps) {
+			const planFrom = bps[pfxFrom];
+			if (!(planFrom.spacing === "normal" || !planFrom.spacing)) continue;
+			const planFromVal = rectifyPlanForSpacingDerivation(planFrom);
+			if (!deepEqual(planToVal, planFromVal)) continue;
+			planTo.spacingDeriveFrom = pfxFrom;
+		}
+	}
+}
+
+function rectifyPlanForSpacingDerivation(p) {
+	return {
+		...p,
+		family: "#Validation",
+		desc: "#Validation",
+		spacing: "#Validation",
+		snapshotFamily: null,
+		snapshotFeature: null,
+		targets: null
+	};
+}
+
 const BuildPlanOf = computed.group("metadata:build-plan-of", async (target, gid) => {
 	const [{ buildPlans }] = await target.need(BuildPlans);
 	const plan = buildPlans[gid];
@@ -189,6 +218,15 @@ const FontInfoOf = computed.group("metadata:font-info-of", async (target, fileNa
 	const sfi = sfm[fi0.suffix];
 	const hintReferenceSuffix = fetchHintReferenceSuffix(sfm);
 
+	let spacingDerive = null;
+	if (bp.spacingDeriveFrom) {
+		spacingDerive = {
+			manner: bp.spacing,
+			prefix: bp.spacingDeriveFrom,
+			fileName: makeFileName(bp.spacingDeriveFrom, fi0.suffix)
+		};
+	}
+
 	return {
 		name: fileName,
 		variants: bp.variants || null,
@@ -230,7 +268,10 @@ const FontInfoOf = computed.group("metadata:font-info-of", async (target, fileNa
 				: null,
 		compatibilityLigatures: bp["compatibility-ligatures"] || null,
 		metricOverride: bp["metric-override"] || null,
-		excludedCharRanges: bp["exclude-chars"]?.ranges
+		excludedCharRanges: bp["exclude-chars"]?.ranges,
+
+		// Spacing derivation -- creating faster build for spacing variants
+		spacingDerive
 	};
 });
 
@@ -321,41 +362,59 @@ const ageKey = uuid.v4();
 const DistUnhintedTTF = file.make(
 	(gr, fn) => `${DIST}/${gr}/ttf-unhinted/${fn}.ttf`,
 	async (target, out, gr, fn) => {
-		await target.need(Scripts, Parameters, Dependencies, de(`${BUILD}/caches`));
-		const [compositesFromBuildPlan] = await target.need(CompositesFromBuildPlan);
-		const charMapDir = `${BUILD}/ttf/${gr}`;
-		const charMapPath = `${charMapDir}/${fn}.charmap.mpz`;
+		await target.need(Scripts, Parameters, Dependencies);
+		const [fi] = await target.need(FontInfoOf(fn), de(out.dir));
 
-		const [fi] = await target.need(FontInfoOf(fn), de(out.dir), de(charMapDir));
-		const cacheFileName =
-			`${Math.round(1000 * fi.shape.weight)}-${Math.round(1000 * fi.shape.width)}-` +
-			`${Math.round(3600 * fi.shape.slopeAngle)}-${fi.shape.slope}`;
-		const cachePath = `${BUILD}/caches/${cacheFileName}.mpz`;
-		const cacheDiffPath = `${charMapDir}/${fn}.cache.mpz`;
-
-		echo.action(echo.hl.command(`Create TTF`), fn, echo.hl.operator("->"), out.full);
-		const { cacheUpdated } = await silently.node("font-src/index.mjs", {
-			o: out.full,
-			oCharMap: charMapPath,
-			cacheFreshAgeKey: ageKey,
-			iCache: cachePath,
-			oCache: cacheDiffPath,
-			compositesFromBuildPlan,
-			...fi
-		});
-		if (cacheUpdated) {
-			const lock = build.locks.alloc(cacheFileName);
-			await lock.acquire();
-			await silently.node(`font-src/merge-cache.mjs`, {
-				base: cachePath,
-				diff: cacheDiffPath,
-				version: fi.menu.version,
-				freshAgeKey: ageKey
+		if (fi.spacingDerive) {
+			// The font is a spacing variant, and is derivable form an existing
+			// normally-spaced variant.
+			const spD = fi.spacingDerive;
+			const [deriveFrom] = await target.need(DistUnhintedTTF(spD.prefix, spD.fileName));
+			await silently.node(`font-src/derive-spacing.mjs`, {
+				i: deriveFrom.full,
+				o: out.full,
+				...fi
 			});
-			lock.release();
+		} else {
+			// Ab-initio build
+			const charMapDir = `${BUILD}/ttf/${gr}`;
+			const charMapPath = `${charMapDir}/${fn}.charmap.mpz`;
+			await target.need(de(charMapDir));
+
+			await target.need(de(`${BUILD}/caches`));
+			const cacheFileName =
+				`${Math.round(1000 * fi.shape.weight)}-${Math.round(1000 * fi.shape.width)}-` +
+				`${Math.round(3600 * fi.shape.slopeAngle)}-${fi.shape.slope}`;
+			const cachePath = `${BUILD}/caches/${cacheFileName}.mpz`;
+			const cacheDiffPath = `${charMapDir}/${fn}.cache.mpz`;
+
+			echo.action(echo.hl.command(`Create TTF`), fn, echo.hl.operator("->"), out.full);
+
+			const [compositesFromBuildPlan] = await target.need(CompositesFromBuildPlan);
+			const { cacheUpdated } = await silently.node("font-src/index.mjs", {
+				o: out.full,
+				oCharMap: charMapPath,
+				cacheFreshAgeKey: ageKey,
+				iCache: cachePath,
+				oCache: cacheDiffPath,
+				compositesFromBuildPlan,
+				...fi
+			});
+			if (cacheUpdated) {
+				const lock = build.locks.alloc(cacheFileName);
+				await lock.acquire();
+				await silently.node(`font-src/merge-cache.mjs`, {
+					base: cachePath,
+					diff: cacheDiffPath,
+					version: fi.menu.version,
+					freshAgeKey: ageKey
+				});
+				lock.release();
+			}
 		}
 	}
 );
+
 const BuildCM = file.make(
 	(gr, f) => `${BUILD}/ttf/${gr}/${f}.charmap.mpz`,
 	async (target, output, gr, f) => {
@@ -363,20 +422,19 @@ const BuildCM = file.make(
 	}
 );
 
-function formatSuffix(fmt, unhinted) {
-	return fmt + (unhinted ? "-unhinted" : "");
-}
-
 const DistHintedTTF = file.make(
 	(gr, fn) => `${DIST}/${gr}/ttf/${fn}.ttf`,
 	async (target, out, gr, fn) => {
-		const [{ hintParams }, hint] = await target.need(FontInfoOf(fn), CheckTtfAutoHintExists);
+		const [fi, hint] = await target.need(FontInfoOf(fn), CheckTtfAutoHintExists);
 		const [from] = await target.need(DistUnhintedTTF(gr, fn), de`${out.dir}`);
 		echo.action(echo.hl.command(`Hint TTF`), from.full, echo.hl.operator("->"), out.full);
-		await silently.run(hint, hintParams, from.full, out.full);
+		await silently.run(hint, fi.hintParams, from.full, out.full);
 	}
 );
 
+function formatSuffix(fmt, unhinted) {
+	return fmt + (unhinted ? "-unhinted" : "");
+}
 const DistWoff2 = file.make(
 	(gr, fn, unhinted) => `${DIST}/${gr}/${formatSuffix("woff2", unhinted)}/${fn}.woff2`,
 	async (target, out, group, f, unhinted) => {