It took about five hours but the rhino bike is back together and appears to be in reasonable shape. I rode it and it performed better than I expected so I'm ready to run it on the trail tomorrow. I swear that is the best homemade design I have ever seen even if I did build the first one without any plans at all. I'm proud of the design.
I also redid a small light trailer to carry along on the trail ride. I need it for stability and to carry the battery pack. The big heavy trailer I built all last week, should be good for parts at least.