Originally Posted by Hawiian Cadder

The kitbot weighs somewhere around 40-50 lbs depending on what plywood and how much (correct me if i am wrong, we tore ours apart a year ago)

Another option is the 221 robotic systems stuff, while a lot more expensive, it is lighter and more effective (middle wheel driven by both cims, ability to use more wheels, and possible a tread system, option for multi speed gearboxes) than either the kit-bot or the nano-tubes.