I hacked the receiver board for toy state industrial tanks: http://atmega.site40.net/default.php?bookmark=Toy State Industrial Tank,megabotz: http://atmega.site40.net/default.php?bookmark=MegaBotz, megatank:http://atmega.site40.net/default.php?bookmark=MegaTech Mega Tank, and heng long 1/30 Sherman:http://atmega.site40.net/default.php?bookmark=Heng Long 1/30 Sherman.
The idea is to reuse the receiver board so that you don't have to buy an h-bridge. Also reusing the power supply makes the finished product a little cleaner. Next I want to reuse the receiver boards from battle bots and Heng Long, scale 1/16 tanks