Hmmm, that sounds promising.
I'd be interested to get some pointers off you on how you built your WPC bench. I can feel another project coming on 
I built mine so it can test both wpc soundboards.
I have also made some adapter cables so i can test wpc-95 cpu , AV and power driver boards.
so if you need any advice feel free to ask
I then have another bench with a whole heap of adapters so i can do WMS sys 3 to 7, 11, data east and sega.
and early bally and gtb are done on another bench.
I am strapped for room also so a bench for each just aint going to happen
