Nice work so far Dann. That's a good idea to represent this as a kit car. Some of those replica builds in the 1:1 world have many thousands invested in them (as a genuine GTO is so valuable). I've seen replica Ferraris with real Ferrari engines, so your model is totally feasible.
The shape of the Protar body may not be 100% according to some, but the 1:1 bodies were all hand made and no two are identical.
I really like this kit, and doesn't it have the most gorgeous wire wheels ever made in plastic!