The kits are finalized, but I'll make an observation or three.
#1 The two keypad kits 
look identical.  If they are supposed to be different, could one of them have a 1u 
+ and a 1u 
= ?
 
  
#2  There does not seem to be any way of getting classic arrows.  Perhaps they could be made available?
#3  With a sculpted profile (great!) the R3 relegendables will be a mis-match in many places, but especially above the function row in a large-format keyboard.  Perhaps a dozen R1 blanks as a kit?
Anyhow, thanks for pushing this forward.  I am still in!
 - Ron | samwisekoi