About the color, having had almost 24 hours with the set, I am super happy with the teal. It absolutely captures that unique TA essence of all the old Josh/sixty pics. It especially looks good at night and under slightly yellow light, which really brings out the green tones.
The blue legends were absolutely the right choice, they also bring out green tones in the mods and add an element of contrast to the whole thing.
If I had to make one criticism, it would be about the gray alphas. I am about 90% happy with those. The keys, which are all slightly concave, tend to catch light in a way that reflects it directly up and edges the capsmore to the white side than the gray side. Thus, the keys look gray as intended when viewed from the side or isometrically, but can appear more white when you're typing on them and looking down. Especially under blue sunlight. I feel like I picked the right gray given the info available at the time and the appearance of the chip itself, but having seen how it looks in keycap form, I'd darken it 1 notch if there were ever a R2. Not a big deal thoug, just something that could be improved even further.
Maybe someday GMK will offer preproduction samples, that would really be great.
Overall I feel it was a great success, and I learned an enormous amount about color, communication, and project management. I hope I can put that all to use in another GMK GB soon!