Here are some fuzzy pictures of the MAME cabinet.  The light on it threw
off the autofocus, I think.  I'll try for some better ones later.
Vinnie, the dog in most of the photos, is about 70 lbs, for a frame of
reference.  Ursa is the smaller dog, and she's about 60 lbs.
It's a pretty straightforward implementation of the Ultimate Arcade
Cabinet II from 
Cybertech Design
.
I went with the full-size cutout templates, which made life a whole lot
easier.  We made some changes, for example, adding casters and just
putting a subwoofer port rather than a coin door in the front, since
this thing will never be a coin-accepting arcade game.
The control deck is a 
Slikstik Quad.  The
monitor is a Wells-Gardner
9200D. 
The internals are a P4 running at 1800Mhz, which is gross overkill for
what it needs to do.  I'm using an ATI Radeon 7500 All-In-Wonder PCI 
for the video interface, because it can generate all sorts of weird 
dot clocks that can really drive that monitor at the frequencies of 
the original games.  I don't have that part working yet--I'm still 
just using Mame32 and Daphne under WinXP at the moment.