yaksplat,
Are you still doing these and can you do a small Stern panel that will latch in to factory location with 2 player / 8 button + P1 P2 Coin + 1 extra button?
So basically 2 joysticks (HAPP Comp) 8 gameplay buttons per player and 4 buttons up top.
The wooden insert under the metal top panel measures 5 3/4" x 22 7/8". Cramped I know, I know the 8 buttons would have to be straight alignment and not ergonomic. Or maybe not after reviewing some of the pics of ones you have done.
And actually that 5 3/4 would be less since there is a support on there as well (across the top) that is 3/4 - 1" (I'd have to measure it). Of course each side has the latch part as well so some more real estate lost (this one might be a tough one).
Thanks,
Jason