Since it is not my build, or my money, I am gonna throw this out there.
Have you considered the idea of attaching, or accomodating, a rotisserie somewhere on the unit?
Chain drive or cable drive? I know cables are easier and all, but, using motorcycle chain is a very cool and beefy look. If you go cable, please use a cable that is thicker, you can get them at Westmarine, they look better than that stupid mini-cable people always use.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."