This would be good to have for the mini cab competition!
If you want a color display for your mini cab, I have a dusty iPaq PDA with sync cable I was gonna sell on ebay. I'll give it to the first interested party for $60.
The screen is a little dusty like most iPaq 3600s, and there is some slight streaking from where someone tried to clean the screen inside. The streaking is hard to see when games are running though, and it runs great otherwise. 233 Mhz processor will play the most popular games in MAME CE at full speed or close to it. Only thing it needs is a charger, which I see all the time on ebay for about $5.
Hanaho makes a gamepad for it that could be hacked instead of soldering wires to the tiny connections inside the iPaq...
PM or email me if any of you are interested!