If you saw the roll cage we just built for my buddy's Avanti you would know that making a tilter would be relatively easy! The hard part would be having a bender that would get the radaii equal on the main hoops. Roll cage tubing (1 5/8", .120" wall minimum) would be more than adequate (you KNOW that I could get the tube cheaply). You could get your machinist buddy to carve out some wheel plates. But I agree that this might be a job better farmed out.

Dan