I looked at the diagram in
https://i.imgur.com/felGSQX.png and those are my comments:
- The third row from bottom-to-up says R4, should be R1.
- The second R5 row has one 1U key; consider having four instead of one, to fully support all 1800-like layouts.
- Shouldn't the R3 1.25U key be in R2?
- The three R2 homing keys are missing; they are specially important in a blank keyboard.
- Consider adding an extra R1 1.25U key, so the 6.25 space bar can be comfortably split (2.25+1.25+2.75).
- Consider adding one column of 1U keys in R1,R2,R3,R4. This will simplify adjustments to the numpad, bottom row, extra Alice alpha and several other variations on physical layouts.
GLWIC!