[ProtoDie]

Years past we used Black ABS plastic,,,,,,3/16 thick.

It was nice & easy to work with, you could heat your bends to hold shape.

In the sunlight & heat it would expand & contract with temp changes.
On a hot day it would get really wavy, and buckle where it was not mounted.
After 2 seasons it became very brittle from the heat cycles

After that we switched to aluminum for racing

For a show, I use clear Lexan,,,also 3/16 thick. Painted the inside with charcoal metal flake . It turned out sweet, and the clear Lexan added a (space bar)lot of depth.

Areas around the rivots would spider crack though, which supprised me , being Lexan.
These panels did not see any real abuse either,,,,,,,mostly shows.
The clear Lexan would also expand in the sun / heat.

I would recomend aluminum sheet metal. You can get pre-painted that they use on stock cars for pretty cheap. $80-100 a sheet I think.

Or bare aluminum then powder coat, or paint

Or bare aluminum with Vinyl wrap. This is nice for when it starts to look a little rough down the road,,,,you can throw a new skin on it.
It seems to hold up well to racing also.

Attached are pics showing each

The Burgundy & silver car has the vinyl wrap
black silver car in the sand is aluminum- powder coat
blk slvr on drive way is clear lexan with paint on the inside
kids cars are pre painted aluminum
blk slvr car in grass is black ABS plastic