The kitting is the only thing I can currently comment on because there's really not much else.
6u spacebars are too niche to have in the base kit. Make a separate spacebar kit with them and more bars for Alice support, 3u bars and such. The blank r2 1.5u is missing the backspace legend, I assume. Not sure what r3 Insert is for. You're missing an F13 and an extra B in the base kit (although the extra B can also be in the spacebar kit). And most importantly, you're completely missing ISO layout support.
Work on the kitting, make some novelties and get some renders done so you can get an actual IC going.
Also since you chose GMK as your manufacturer you're going to have to hide the inspiration because of GMK's intellectual property policy.