Great project!! I'm in favor of leveling the rockers and loosing the bumpers. Also, I'd do a high end interior using leather, but use safe seats as well as a roll bar/cage. This car is at the point of power to weight not to think safety first and include it into the design...but you're a smart guy and have already considered this I'm sure....
My uncle is an aircraft mechanic and pilot too and I can tell you are very similure to him in your approach to doing things...ie, clean and well thought out!! Perhaps it's an industry standard.
Keep the updates/pics coming!!!!