I think the most striking thing about it is the fact that it is a roadster, most if not all the models I have seen have been coupes.
Initially I thought it was plastic that had been plated or metal sprayed, the lack of definition between panels made me think of that, but at 4lbs weight that is probably not true. Neat and interesting model for sure.
Edit
I think the metal is nickel and it was metal sprayed. I thought that it could be a model to make moulds from but the finish is not the best for that. I suspect that originally the hood and doors etc opened but the spray sealed some gaps. The steering wheel has what appears to be damage from heat.