Read my mind :(
I'm going to make an antweight bot from a kit for Combot in San Fransisco. Google Combot, first result.
I'm making a lightweight thwackbot that uses wheelchair motors.
It's gonna be invertible, and I'm gonna gear it so the wheels spin faster.
I mean seriously, you don't need to push 400 pounds of metal when you're a lightweight.
It'll be able to push two hundred pounds and be twice as fast by the time I'm done with it.