It is more than possible to make you own SNES cabinet. You have two choices for controls. One bolt down a few SNES Super Advantage controllers, or go buy Happs controls (Buttons and 8-way sticks, and then wire the buttons to a SNES control pad's circuit board. (1 wire from each button to each button sensor on the board, with a common ground for all.)

You could add in a coin slot which triggers a digital timer hooked to the power feed for the SNES. IE - A quarter could trigger the timer, and turn the system on for 10 minutes a pop, or something like that. The question becomes then, how do you select between multiple games? Well, option one is to emulate the games via zSnes or something of the like, of course you would have to make a custon frontend for it, so that the games can be selected by the controllers, and gives you a limited list. Option B would be to build your own multicart rack. You could use this (http://www.snega2usb.com/wordpress/) as the base, and then place them in series with a selctor, perhaps, even showing them through a plexiglass window on the cabinet so your player could see what games were currently on the system.

The same kind of setup could be created for almost any console.

Though, you wouldn't have to do anything special for Neo Geos, as the MVS (Arcade) and AES (Console) are the same.