Please review the kits and let me know of any suggestions you may have, some stuff may have slipped past my eyes but I've scanned it over a several times to fulfill most layouts.
Base
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Add-on
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Mono
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Oh, and we are rolling with Infinikey - I'm sure a lot of people can appreciate the cost factor as well as the cherry profile.
Kits look good for the most part! I would suggest changing R4 1.25u Menu to Fn, though, since there's no 1.25u Fn key anywhere in the set right now — a key that's regularly seen used on 60%, 65%, 75%, TKL and other keyboards. If Menu is something that you really feel is worth including, it should be in the add-on kit, but it also may not be necessary at all. Either way, Fn is more important.
Other than that, there's a duplicate set of darker blue 1u Ctrl and Alt keys: one pair in the base kit and one pair in the add-on kit. I think the one in the base kit is superfluous, as 1u LCtrl and LAlt would only be useful for 40% boards, if I'm not mistaken.
Finally, it'd be cool to see a R3 1.75u Function key added to the add-on kit. Mac users may like a R3 1.75u Command as well.
(Edit: Looks like there's a 1.75u Function in the mono kit, but not in base 🤔)
I'd also maybe move numpad 00 to the add-on kit, not sure.