Steel or Fiber??

[band1t]

Hey all,
i am having a hard time deciding which root to take with my car,
i could do steel, carbon fiber, or fiber glass body panels.
Yes I know steel is heavy and can rust but that's not a factor right now.

How does carbon fiber and fiber glass hold up compared to steel?
Do they wrap out of shape over time?
i mean if take the car out on a hot day how would they hold up?

if I bolted on carbon or glass today went pro tour trips int the hot summers
30 years later will they still be like new or all wavy from heat.



so steel carbon fiber or fiber glass?