[ksafin]

To answer some questions:

This is a 4 wheeled mecanum drive train. We will be using belts, not chains. For belt tensioning, we will simply slide the gearbox (it's slotted) as it will sit on the holes on the inner length plates.

The metal is 1/8" thick.

As far as whether our cuts on the length plates would reduce stiffness, we weren't too sure, so we have two standoffs there that we hope will do it. Ultimately I feel that any loss of rigidity won't be too significant but it's something we'll see once we get this cut and assembled.

Our design is to have minimal ground clearance; it would push frisbees out of the way. The bigger reason was to have our mecanums just touch the ground though; lower Center of Gravity by doing so.