[Kevan]

I also have a Proslot Porsche, which I believe is the body that Revoslot use on their model. Wider arches and high wing.

I think that's a relatively modern GT2 Porsche not a 60's Porsche.

In fact now it's been mentioned, the Revoslot is a late 90's GT2 not a 60's/70's 934. If this is a period proxy they shouldn't be included.

It might be a good idea to check what era a car is from before rushing headlong into a car build.