here's a photo of the rear chain drive while we were working on the project. I've since taken out another half link in each chain.
Cutting round tube/pipe to fit together is not an easy task....especially if you don't have the proper tube cutter gizmo.
A hole saw that is the same diameter as the outside of the round tubing. Using a vice and a drill you can make cuts that look like this:
which allows you to join the two pieces nicely.
here's another photo from early in the construction project. It shows where the rear shocks should be, instead of the square tube that is living there temporarily.
Debating right now between air bags or air shocks. Bags would last longer i think, but air shocks would pretty much just bolt right in with only slight modification to the attachment points.