I'm not particularly qualified to talk about drive chassis durability, so I don't have much to add.
However, I think I can save you some weight on this, or another drive train that you build. Having a pair of sprockets with built in hubs is heavy, and having those extra couple of inches of steel shaft is heavier. What you could do is take an
AM hub and attach a pair of
sprockets to it, spacing the sprockets with
bits of plastic. Then just run enough shaft to cantilever the sprockets and hub.
A top down view would look like = []: () : ()
Where = is shaft, : are spacers, () are sprockets, and [] is the hub. Spaces are only there to prevent them from being turned into smilies.
Does that make sense?
