After my first trial , I did some internet searching to find other designs. I had seen one in Garden Railways magazine that I liked with the track on an open ladder and held up by poles. So when I stumbled upon O Scale Trains By Ron  on YouTube, and he had instructional videos, I knew I had my new approach. Ron also has some instructions and photos on his website . We'd see if this worked out. I tend to be a little impatient when starting a new project so once I had the idea of how the ladder railbed would go together, I dived right in. The basic design would have two pieces of PVC lattice board forming the supports (girders) with PVC trim cut down to be spacers. Holding the whole thing up I would screw the ladder railbed to a plumbing tee (mount) attached to a 1" PVC pipe which would telescope out of a 1.25" PVC pipe which is sunk into the ground. Since I was using track pieces with known radii, I thought I could calculate the inner and outer radii of the ladder...