Sbox Homemade Console
Anonymous Coward sent in: "I just ran across a very cool homemade emulation console. It emulates multiple machines, plays movies, plays mp3s, and uses Intel's new wireless gamepads to control everything. It's also cased in plexiglass and uses its own menuing software. The best I've seen yet!" His remote has a docking station.
In addition to the MAME front-end of the same name, the site features a nice collection of pics and links to converted and custom-built cabinets. IIRC, the Plastic Cactus site linked from this page has a set of measured drawings that might be useful, and there are probably others too.
There's also the very nice Build Your Own Arcade Machine site: http://plaza.powersurfr.com/kevin/arcade/
Both of these sites are geared toward creating cabinets for use with emulation, but if that's not what you're after I'm sure they could be adapted for true arcade hardware. I've been thinking of building something like an Sbox myself, someday when I magically become competent with power tools. ;-)