I went ahead and ordered the .125" thick stuff. That should do for the battery tray. I ordered two 1 foot lenths of angle. One is 1"X2" and the other 1"X1". I'm just going to epoxy the two together to make a tray.

I ran the 8L tonight on 3S Lipo. It was pretty fast. I'd guess about 40 give or take a bit. Motor didn't over heat. ESC was fine, but my battery started smoking. It got HOT. I think the smoking was from the shrink wrap melting. I let it cool, balanced it and charged it. I didn't notice any puffing. So...8L on 3S = too much current. I switched back to the 7XL and ran that on 3S with a 16T pinion. I noticed a bit of a drop in motor temp and it ran fast. Fast enough the be one of the fastest on our track. I'm guessing that 4S with a 14T pinion might be about right or a bit too much. I should have listened to you guys and gotten the 1800 kv motor. I'm just afraid that the 7XL is going to be undergeared when I gear it for the track. Maybe another motor is in order. Perhaps a 9XL or maybe an 8XL. I've gotta think about it.