Gotta say i love this set! Will grab it when it comes to GB for sure.
My 2c regarding the current kits below:
1) R4 Pg down must have been forgotten in the base set? There is Page Up R3 but no Pg Down to compliment it below.
2) Consider adding 1u R3 novelty for Mod Type-S. 65% users can make a pure novelty rightmost mod column. Would be quite nice.
3) Maybe add one 1.75u R3 novelty for Capslock. Many ppl use it for Ctrl/Fn anyways and will give a nice touch to the whole set. I would go with Esc / Caps / Bottom mods / Enter. Second option might be to make one of the three 2.25u keys to 1.75u.
4) Personally prefer centered mods. I don't dig the lack of symmetry with non-centered ones with the rest of the keys.
5) I really like the Berserk secondary alphas and it's legends color. Maybe keep it as pure latin without hiragana sub legends in order to distinguish it more from the base alphas. Still not sure if i like the mixed legends on base alphas or not. For all other sets, i prefer pure latin tbh. Berserk could match well with one of my upcoming iron165's.
I hope you will think about my suggestions above