sounds yummy...
still sounds your taking the water cooling thing to heart lol jk, i'm sure that theylle never over heat.
but heres an idea:
find small surface mount digital pot's and shift registers, and have them on the bottem lets say, or a diffrent place where theres room, that way, they still cost the same, but take up much less space on the board, you won't have to sacrifice room.
also, program the 2 arduinos to understand that there are 2, that will most likely make it esier to communicate between them, or even make them act as 1!
and maybe pre program all the extra pwm pins from the digital pot's, and the shift registers as arduino pins, so instead of having to type extra code in the prgram, you can just say "arduino pin 38" becuase it will name pins from the shift registers accordingly!
god damnit, if i only had this b4 i started working on my button pad, i could have been having full color dimming with no need for refreshing each button...
can't wait for the prototypes! please keep the updates comming!