I think I misunderstood your original query, upon a second reading...
Are you making a desktop controller (er... lap controller) to interface with your PC/consoles? If so my advice was off center -> I assumed you were using the whole astro city cabinet, and not just the control panel.
An ipac, or key wiz or mk64, or playstation pad hack or x-arcade pcb with adapters *may* be what you are looking for... depending =P
good luck,
rampy