This is truly beautiful. I see a few hints of different cars in the design.
First, I see hints of Aston One-77 in the front. Mainly the headlight shape, but a tiny bit of the grill shape seems to be inspired by it. Maybe an altered, upside-down idea?
Second, the profile. It has some Ferrari 599 in it. It even appears the rims were inspired by the standard GTO rims.
Third, taillights. Maserati anybody?
Overall, this car gets my approval. Best looking Viper out of all of them.