this board is very far from perfect (i think only one of the ADC channels works, one of the level-shifted lamp outputs is busted, and there's something horrible going on with the locally-regulated -3V rail), but i'm starting to get stuff going with it nonetheless.
this evening i've managed to set up both the carriage (moves the film) and autofocus (moves the lens) motors and their respective limit switches, confirm communication with the ADCs (such as they are), and turn on the lamp. i think i can work around the missing lamp output (worst case, I'll just remap that one to the IR channel), and assuming i figure out the -3V regulator issue tomorrow i should be able to start acquiring images!