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• Your base kit is missing R3 PgUp, R4 PgDn keys for 65%/75% support. You may optionally add these keys as R3 Prev, R4 Next (
example), so that the legends are generic and can be used for covering other layouts as well.
• I would probably move the accent arrow keys to the spacebars kit. Imo, accent arrows are not really necessary for this colorway to work, so I would make them an optional purchase. It's better to include more layout compatibility instead. Also, your spacebars kit already uses both colors, so moving the accent arrow keys there won't affect the price too negatively.
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• The
₩ sublegend on the 1.5u pipe keys should be all the way to the right instead of in the middle of the key.
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• You can remove 1.75c space, as this size is not really useful: it's used only on a limited number of 40s boards, most of which require not one but two of these spacekeys; and your set doesn't have the rest of the required keys for these boards anyway, so a single 1.75c is unnecessary, which is why most spacebars kits don't include it.