I opened an NES, and it is just the right size board for my case. Thanks for the data! Just to protect against codemaster incompatibility, I'll try to make Pin 4 of the lockout chip have a switch so I can set it to "NORM" and "UNI" mode.

Curse you, evil RF shielding! CURSE YOU, I SAY!
-MM007, the novice console case modder