Actually the control panels aren't removable, we just used the original cocktail plans for a guide and then kinda winged it here and there. The controls were really easy to wire.
Here's the system specs:
Dos advmame 62 with ArcadeOS
Hacked sidewinder joystick.
PII 266Mhz system
Monitor 21 inch computer monitor that I picked up at a surplus computer store for $60.
Controls:
2 Happs supers (1- 8way and 1-4way)
1 Wico 2/14 trackball with a hacked mouse
The system work excellent although it does take a few seconds extra to load the games since it's only 266mhz. But, since we running nothing but classics, it works well.
Steve