I have

Mame, virtual pinball, a 21" monitor, ... but no sound

winamp sez the system is missing a driver :(

quite possible. I haven't had any speakers plugged in til now, so quite possible it was never making any sound. Not easy to locate .. the system uses integrated Realtek audio on the MB.

I had to mount the extra USB ports into one of the front panel drive covers, but looks like the USB is working ok. It loads/runs a mouse and the external drive ok. It should handle the control panel inputs without any problem.

making progress. I guess I'm at the point of integration testing. Had to update the driver for the sony monitor.. its a little washed out, and tried messing with it, so it looks a little better now, but still kinda funky.