carbon fiber and/or aluminum shops?

[maxxdude1234]

CF won't stratch as easily as aluminium. You could also consider putting a very thin piece of lexan on the underside of the CF/aluminium to protect it.

[BrianG]

I don't mind if it gets scratched, after all, it is a monster truck after all. :) I just want to make sure whatever material I use can take a beating while remaining lightweight. I also don't want it to flex much since the bottom of the truck will be the battery tray bottom and I want to protect the batteries.

Now, I was planning on 1/16" thick 6061 or 7075 aluminum, but what thickness of CF, or even garolite as MetalMan suggested, would be equivalent in strength/flexibility/durability/etc?