(x-post from Reddit)Not having full HHKB layout compatibility in 2018 is ...
irresponsible.
Jokes aside, I'll almost definitely join if you add the missing R2 1.5u Backspace and R1 1u \|.
The inverted color accents (colored keys, black legends) others suggested also sound good, but I'm already sold on the colorway as it is (maybe offer the accents as an extra kit).
Having a
color wheel as an accent could also be fun.
Finally, you might want to consider making the extra R4 Fn key purple (DY), as to my eyes it's obviously intended to be used to the right of the 1.75u Shift. In that position, the cyan key would break the purple stripe going from += down to Ctrl.
Either that, or replace the right 1u Win key with an extra Fn so both cyan and purple are available.
Or have all three.
All in all, this kit looks really cool. Glad to see another fun, smaller scale GMK set in the works. You've definitely tickled my fancy — I'll be keeping an eye out for updates.