The Control Panel

 I didn't use Scott's control panel layout,  rather I designed a bi-level control panel with the following features:

	Two-Player, six button capability
	Trackball for Centipede, Missile Command, etc.
	Spinner for Tempest, Tron, etc.
	Coin buttons for quarter free operation (though the coin box will accept quarters and register credit)
	Raised shelf provides a flat area to accommodate integrated cup holders.
	The 3" Happ trackball is lit by a Radio Shack high-brightness LED wired to the PC power supply with a voltage limiting resistor. (Oscar Controls has a good write-up on how to do this here.)

(Caveat for anyone considering a 2-tier arrangement like mine, I played a few bowling and golf games after reading this thread. The shelf is a bit in the way for those games where you need to give the trackball a really fast, straight roll. That said, this is not a big problem for me because:

	The games most often played on my cab are 80's classics that are not affected by the shelf.
	IF you are aware of the risk of smashing your fingers you can pretty easily use your palm and push up on the ball rather than straight.

If you are building a cab because you just can't wait to play hours of bowling and golf games, consider another design!)