JersernI don't think this is correct, I think there are actually very few compatible keycap sets (which is what is keeping me from participating in this drop) because of the following differently sized keys:
1. The delete key. Usually 2x, it's 1.5x here.
2. The right shift is usually 2.75x, but this one is 1.75x
3. the key next to the right shift. You'd have to put something from your regular set here, don't know what else you'd put here (maybe up arrow?)
(see http://support.wasdkeyboards.com/customer/portal/articles/1366948-keycap-compatibility for "typical" keycap dimensions)
So you couldn't use some random good-looking set that you see like the two-tone set here (https://www.massdrop.com/buy/two-tone-doubleshot-abs-keycaps/talk) Furthermore, different rows usually have different profiles (the exception being profiles like Signature Plastics DSA profile) so you can't readily switch keycaps between rows with different profiles.
I think you're pretty much limited to the black blank set or the $60+ one made specifically for it (https://www.massdrop.com/buy/infinity-dye-sublimated-keycap-set) unless there's another source of keycaps that I'm not aware of.
chachaActually, with the layout, if you chose to use stabilizers instead of keyswitches in some areas the stem spacing actually seems correct, and you could reconfigure the keyboard to whatever layout to match the keyset that you have.
EDIT: At least this is what I can observe by looking at the diagram.
chachaIf you are not part of geekhack already, I suggest you to join it, recent sets like macross and granite came with 1.75u shift, and appropiate keys to replace the back space key for 2 1u keys like backslash and tilde. Any DSA sets like these will have keys that may be used for the 1u key at the right of the RShift, like delete, a function key, or whatever you want. Some upcoming sets at pimpyourkeyboard may have some alternatives for those keys.
chachaSignature plastics (the same company that is making the black key caps and the infinity key caps) sells blank pbt sets in other colors and will sell keys individually as well. So for the standard layout you can purchase the standard key set in one color and purchase the modifiers individually in different colors (it is cheaper to get them individually than getting the modifier set).