What about Mr. Scrape? They're in Sumter SC. They've done some great builds. A bunch of cover vehicles. www.mrscrape.com. I'd search for their number and give them a call. They don't update their website frequently. They do alot of the donk stuff but they're true minitrucker's at heart.
tradd also likes black mambas... give tradd a call he will be very fair with your pricing, the biscuit and black mamba thing is an inside joke between me and tradd