cool its nice to see I've stirred the bot builder in you.
I have my new base and have been playing about for a few days using the transmitter and receiver that came with the tank, that was until me being careless 
had the battery jumper leads switched during testing, I only let the magic smoke escape from the RX ic :-[
Anyway I have some photos I am just about to set a new flickr and youtube account so I'll get something posted.
Anybody know any good H-bridge designs using IRF3205 NPN MOSFETS, or cheap designs that will handle at least 20A just to be safe :-?