okay heres the latests!! found some .03 thick lexan it works PERFECT. you can bend it and all sorts of stuff so this is what i did..
first cut a big piece to cover the whole chassie and stick clear out to the body.
next i bent up the edges because when its flat rocks can still get in there, but when they are bent up it makes it a lot harder.
then i also rolled a piece up around the back to protect that opening.
the .03 is perfect, it doesnt crack and as you can see you can bend and roll it and it works great! enjoy guys!