Sounds like a nice problem to have. :) I do have a leftover multi-Taito board from when I was originally going to build my own before I decided it was too much work and aborted and bought Frizz's machine. If you're interested at all, shoot me a PM and I'll give you details.
Ah. Gotcha. So what is wrong with that? I don't have space, so I'm running a multi-Taito in an E.A. cab that I bought from Frizzlefried. E.A., J.K. and Zookeeper all in the same cab (plus 17 other shitty games I never play).