Would the use of one of RC Monster's heat sinks help? I'm just thinking that a rear brace could make quick pinion changes a PITA. I'll see what I can come up with.

I just finished version two of my motor mount. I used a piece of 3/16 aluminum. I was going to go 1/4", but felt that it would be overkill. I'm at the point that I'm watching the weight. It's plenty rigid. Attempts to "jiggle" the motor results in the whole center diff mount shimmying (is that a word?). It's what I want. I want the motor to move with the center diff. I got in some aluminum diff mounts too. With the aluminum diff mounts and the new mount I was able to attach the mount to the diff mount at five points. Two through the top and three from the side. It think I'm going to be sticking with this mount. Now I just have to figure out the suspension.