The 1954 Pontiac Bonneville Special Coupe was a fiberglass-bodied Motorama show car.
This was Pontiac's take on the Corvette notion, and not to be outdone by the upcoming Mercedes-Benz 300SL Gullwing, the Bonne-Special's fiberglass bodywork was capped by a canopy, sporting its own flip-up clear panels. It was powered by a Pontiac flathead straight-eight, fed by a squadron of sidedraft carbs. The interior was also aircraft-inspired, and the rear styling gave the impression of a larger afterburner-shaped trunklid.
Source: Internet