Base
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Numpad
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You can move the R1 1u
End,
PgDn keys from base to the numpad kit since they are only ever used together with the numpad on layouts such as 1800/CP/96-key.
There is a duplicate R1 1u
Delete key in base which should be removed.
It appears that you have a R3 1.75u
Enter key in base as part of 3-key 40s support. However, this is incorrect — the Enter should be 1.5u.
You may optionally add a 2.25u
Shift to the base kit. This provides physical compatibility for 660 layouts.
Another optional addition would be two 1.5u
Super keys together with a second 1u
Alt. This is for Mac and OG HHKB bottom row setups.