[jagoldman]

I think that is a nice design especially with the option for both 6 and 8 wheel drive. I was wondering why your side bumper supports are oriented horizontally instead of vertically. Additionally, it is pretty easy to cut a hole in the top of your change (where the chain is running) and put in a basic chain or belt tensioner if your end up having that problem. In the past, I have found 3D printer parts with a bolt to be great for tensioning.