Team 241 decided on the nanotubes with the built in gear drive of the center wheels. To get six wheel drive, we figured out that we needed to ADD the sprockets that normally come with the sprocket nanotubes to the gear-driven center wheel order. AndyMark's folks knew exactly what we were trying to do and made sure we ordered the right sprockets and widgets.
Our students designed and built an "exoskeleton" out of 1" sq tube and connectors and bolted it right to the nanotubes they had assembled.
It's only been 12 days and we have a sweeeett drive train and chassis already done ready for electrical component placement. We are probably 10 days ahead of where we normally are and we are pretty much guaranteed our drivetrain will stay aligned. Mentors did not have to touch a thing! What a great feeling.
We can't wait to drive it.