A nice design, but I see alot of access issues. When people design a layout they assume that they can let the trains run with little or no attention, but that often leads to derailments or worse. A popped coupler can cause collisions, especially when two trains share the same track. It may seem unlikely, but it does happen.
The lack of open aisle into the center will make access problematic as you get older- wheelchair access is non existent. Please don't take this negatively, but I see it as planning for long term use, not as a layout that has to be demolished because of a change in our mobility. My 80 year-old father is in a wheelchair now after a stroke, so it changed how I look at any access to any room. Your benchwork can reduced to give more access, and good scenery will always draw people's attention away from less real estate.
Your design seems to place the viewer/operator on the one open side of your layout, which is fine if that's your goal. But a more open viewing area in the center would not only be more inviting to visitors, but also give your layout multiple vantage points, and make access, maintenance, and doing scenery far easier. A town, and the depth made by buildings next to each other, can also be established visually by backdrops- you mention you layout is set against three walls, so backdrops would make the layout seem larger too.
JMO,
Geno
