Damn, I'd offer to help, but I'm faaaaar south of that. That Drafthouse is nice and spiffy inside, you gonna move all the leather sofas out to make room in the center?
As far as sponsors, I'd try Discount Electronics for the PCs, and maybe Arcade UFO, but these aren't really arcade cabs so that's probably not the best idea. There's, of course, always that jovial fat man of Austin cinema Harry Knowles. No doubt he'll be at the film fest, so maybe AICN would throw in a little sponsorship.
How did you approach the theater about this? Are they not supplying you with any money for the project?