Take the B-pillars and fenders from an Opel Speedster:



While you're there, add the gas cap that is normally on the right-hand side of the car and put it on the left:



The mirrors from a Viper SRT-10:



The headlights look like the ones from the '02 NSX were used as a starting point, then extended and the little projectors pasted on. I can't figure out what car they came off of. The rest of the details (hole in the hood, etc) were drawn in.