Attached is a PDF document, SCARM file and a number of snapshots from SCARM of a proposed multi-level layout. The PDF document is a detailed description of the layout. It turned out so long that I have posted it as a PDF rather than putting it in the body of the post. I suggest reading this first as it will explain what you are seeing.
Please review and comment. The design is quite detailed and far along, but if someone has a brilliant improvement that requires a rework, then it will be worth it.
Many ideas and substantial help in this project was provided by forum member DoubleDaz, a great layout designer.
The SCARM file is complex with many layers. The PDF document explains the structure of the file. Because of quirks in SCARM some of the 2D views do not show all of the figures. Everything is correct in 3D.
Thank you for any assistance.