[thefro526]

Thanks Anthony!

The underside of the tubes looks like the top, except the slots are two inches longer (6.5" long) to allow the wheels to be put in. The extra two inches of slot on the outer wheels is biased towards the center to maintain enough material at either end of the tube to keep some structure.

Right now there aren't any tensioners in place, the axles were placed apart so that we'd use a whole number of chain links (no half-links) so the chains are pretty tight. There are holes to allow delrin idlers to be bolted into the tubes to help tension the chain a bit, but we won't know if we need them until the chain stretches.