On testing the hinged support (with a minimum number of screws) for the Rock Island Sandown N Scale Layout I realised that I had placed the hinges on the wrong way around and that I needed them to allow the layout to be lifted from the front.

This photograph does not look as if much has changed overnight but given the extreme Chemotherapy-Induced Neuropathy (a condition that happens when certain cancer treatments affect the nerves that carry signals between the brain, spinal cord, and the rest of your body — especially in the hands and feet) in my fingers I did a pretty good job of installing 3 piano hinges with very small screws on the back support.
Having fixed that screwup I now only have to cut the support braces to size and attach them to the front and back layout supports. I am then good to go with the second sheet of 8′ x 4′ plywood as a base for the 50mm insulation foam board. I am finding that in spite of the difficulty of using my fingers I am greatly motivated by achieving the continuing layout build each night.