Is safety really a concern with it when the space frame chassis is what would protect the occupants and mechanics?

I can't imagine there isn't a lightweight plastic out there that isn't subject to distortion under high heat conditions and with UV light. Plastic bodies have been used on car bodies for decades. I'm just looking for a more extreme lightweight.

Why would I not want lightweight? It's not about how much horsepower you have, it is what the power to weight ratio is. The 2005 Lotus Elise only has 189 horsepower yet it accelerates from 0-60 in 4.9 seconds. The 2005 Ford Mustang GT has 300 hp, but it takes 5.5 seconds to accelerate to 60 mph. Weight is a huge factor when it comes to car construction.

I got my information from www.supercars.net so if my numbers are a little off I apologize. The idea still holds though. Matt