Body work is somewhat up to the finishing guys. It's not a Ferrari, but the one and only I saw on the road was pretty good. Their second Gen is supposed to be much better.
As for performance, it's sort of a mid-engined lightweight Vette thing. The objective numbers I've seen from moderate power plants are pretty gnarly.
I love FFR, the Cobra, the Daytona, awesome. They don't have a GT40, maybe you're thinking of RCR.