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#1  
Suspect you would need h-bridges for the motors. They don't specify the mperage, so more research needed. Seems awefully expensive for a bot with only 5lbs carrying capacity.
Alan
#2  
I noticed on the assembly guide that they are using a Sabre-tooth motor controller.

Another good base is Traxxas chassis, good quality, good suspension, etc. and you can find them used on local buy and sells.