Quick thoughts:
- R2 \| is missing in the alphas kits (disregarding the HHKB ones); R3 #~ should be in NorDeUK instead.
- R3 1.5U \| is in the mods kits instead of the alphas kits for no apparent reason.
- Is the NorDeUk list of supported national layouts the usual band of five? (Danish, English (UK), German, Norwegian, Swedish/Finnish) And... why? This is KAT, so it should be feasible to break this up into, at the very least, NorDe and UK.
- The NorDeUk kits are missing the numpad comma (although I'd put it in the numpad kits). I'll check in detail later, but so far there seem to be no other obvious errors or omissions there.
EDIT: one more:
- The F row kits seem to be the only ones with R5 keys. If keeping with that, they need to add keys like Insert and Delete (for 75% keyboards) and move the R4 End and PgDn there (for 1800 and 1800-like layouts).