Turns out the palette is actually identical to that in wh40k.pcx

investigation/Palette/generate-palette

@@ -0,0 +1,34 @@
+#!/usr/bin/env ruby
+
+lines = File.read("palette.ppm").split("\n")
+lines = lines.select { |l| l[0] != "#" }
+
+raise "Not an ASCII ppm" if lines.shift != "P3"
+raise "Incorrect dimensions" unless lines.shift == "1 256"
+raise "Incorrect maxval" unless lines.shift == "255"
+raise "Too many lines left" unless lines.size == 768
+
+puts <<EOF
+package data
+
+import "image/color"
+
+var (
+	Transparent = color.RGBA{R: 0, G: 0, B: 0, A: 0}
+
+	ColorPalette = color.Palette{
+		Transparent,
+EOF
+
+lines.shift(3) # Ignore idx 0
+
+255.times do
+  r, g, b = lines.shift(3).map(&:to_i)
+
+  puts "\t\tcolor.RGBA{R: #{r}, G: #{g}, B: #{b}, A: 255},"
+end
+
+puts <<EOF
+	}
+)
+EOF