Very nice looking set. Are kitting suggestions / changes welcome?
Some generally stylistic, and mostly kitting-related but some changes I'd suggest:
Given the classic & Cadet styling of the set--
1. Nav cluster legends: "Print - Scroll - Pause" to OG-styled "Prt Sc / Sys Rq - Scroll Lock - Pause / Break", this will also be consistent with the two-line "Num Lock" legend.
2. Numpad sublegends: Adding sublegends (navigation, arrows, etc) to numpad number keys. This would go nicely with the busier Cadet look on the alphas, as well.
3. Duplicates: R1 Tilde key and R2 1.5 Pipe key are redundant. Remove.
4. Remove R3 Pg Up and R4 Pg Dn from Base, in favor of moving 2u / 2.25u spacebars (and maybe also 6u bar + 2x R4 1.5u Super) to Base. I personally would advocate for a more compatibility-focused base kit. The second B is in base, but the spacebars to go with it are split off.
5. Adding 2x R4 1.5u Super to any of the two kits (as they're currently absent).
6. Stylistic, but I'm not sure if it's preferable to force accent Esc/Enter for 40s compatibility. Perhaps you have better survey/data on this. Consider changing to regular modifier colors.
7. Purely a designer's choice here-- but would consider moving arrow accents to child kit so that the 2u / 2.25u / 6u spacebar compatibilty stuff can make it to Base.