He said the PC & monitor were provided.
so he just needs the cabinet.
It won't be pretty, but it might be doable.
depends on what he can find at the hardware stores.
If he's got tools like a router he can skip moulding.
Legs/feet aren't essential and neither is a marquee if going cheap.
wiring- if you buy a few encoders with wires you really don't need too much more for wireing.
something like this for $60 shipped.
http://www.ebay.com/itm/2-Player-Mame-Arcade-USB-Kit-w-2-Joysticks-4-8-way-16-Push-Buttons-60-in-1-/221471126662?pt=LH_DefaultDomain_0&hash=item3390b53486speakers can be any old PC speaker.
Screw it & glue it is what Holmes on homes says & I agree 100% there when using thinner wood.
if it were me, i'd build a vigolix type cabinet or hit up mr 2nd's for some cheap 2x4's & partial pieces of plywood.
Frame it up, screw on the plywood, round the edges with a router or even just a sander, fill in the spaces with wood putty, sand it smooth & paint it.
Preferably a dark semi gloss so the filler and imperfections don't show too much.
He isn't looking for a show piece.
He just wants to play some mame.
I'm assuming in something that won't collapse or fall over when he and a buddy start torquing on the controls.