cool little find. It would be interesting to nail down what it was and possibly restore it, but it looks like it's been hacked up more than a young college girl in an 80s horror movie. Regardless of the route you take to "recovery" of this, i'm always interested in the projects you undertake. I'll be following this one.
I'm getting the bug as well. I haven't even finished plans for my MAME cab, and i'm already trying to find other cabs to restore and a dedicated Taito cab to make a dedicated Rastan cab.
*cough* YOTS *cough*