Hey Ken. I may be a little late incoming to the dance but here are my thoughts. I did not see anything about a different layout configuration other than the concentric loops. Since this is only an exercise in planning for the future...how about considering something like a folded dog bone design.
Here is my reason. My old layout (cover feature in RUN 255) was the same basic plan as yours. It was also about the same space you currently are considering. It took me a long time (life, kids, job) to get it complete. Honestly, towards the end I just wanted to get it finished to showcase in the magazine and I met my goal. It was a nice layout but all the trains did was run in concentric circles (3 of them) while I made up new ones in the yard areas. I thought I would never grow tired of watching them go around but I did. After the feature, it sat dormant for two years while I planned my new layout. Then I ripped the whole thing down.
Now retired, I have nothing but time to work on my new layout. Granted, the new layout is much bigger as my train room expanded to fill my entire basement. It is a folded dogbone design. Three levels. All independent from each other. No grades. Lots of scenery plus passenger yard, engine facilities and hidden staging. You may be able to do a folded dog bone and not have to deal with lift out access
Just my thoughts, I am not trying to pick apart your design. It is well thought out and I like it. I just hope you will not grow tired of the circles.
As far as a bathroom...I would nix the whole idea. Either go outside or in the house. Honestly, how many times a day will this happen?? However...I would consider adding a slop sink somewhere in your area. Once construction starts, the available water supply for washing hands is a big benefit. Once scenery construction starts and the paint, glue and ground foam starts to fly..you will be using the sink nonstop for cleaning brushes, etc. I would not want to perform that task in a sink in a bathroom setting. It will quickly get "hogged up". I installed one in my utility room and use it multiple times a day while working on the layout. And, if you need to go really bad....just turn on the cold water and have at it. That was my plumber's idea when I wanted him to install a urinal in the room!
Have a good day Ken.
Donald
