I used plexiglass (1/4"!) on the underside of my Mad Force tray, works great. If you don't mind Brian, I'd like to have mine in there too :)

I also use Delrin plastic, (cutting board stuff). It can be found anywhere and is really cheap.

thats not the battery tray anymore lol.

that was for my first run. i just wanted to get the truck up and running.

i now have a nicer battery mount and it is quite solid.

ill get some pics later.