Back when Gerry Chevalier was doing the Cheetah in his Mini Exotics line (long before he sold it to R and D Unique), he suggested using the AMT Mercedes 300SL Gullwing kit as the "donor" and the AMT 63 Vette for the FI engine. After I bought my HRM version, I gave my kit to Bill Lastovitch (of Revell) and he had a 300SL to combine. Sadly, he died before he took it on and these went away in the estate sale. I have heard of some folks doing the whole thing with AMT's 63 Vette but have never seen a WIP or finished product.