Thanks for the info Harold.
I got tired of cleaning out all the dry grass that was accumulating inside my truck - around and under the center driveshafts, with so much piled up in front of the rear shock tower, it looked like I had a bird's nest in there after every run. So I made some simple side body panels from .03" lexan:
It also serves as protection for my components. I didn't realize it until I painted these yesterday, but I had the black parts on the truck unpainted when i had my accident the other day - and you can see the dent a couple inches behind the front body clip, a dent which otherwise would have been in one of my batteries!
I'm only putting these on the sides, so I'll still have good airflow down the center of the chassis and air cooling should still be good. When I tested these out briefly last night they worked great - no junk inside!