My current layout started on a single hollow-core door. This is a standard shortcut for many N-Scalers, although in retrospect I would have built a more sturdy platform with a conventional plywood base, it was quick and easy to set up.
Since my first N Scale layout, I've learned a lot. This page shows the very primitive track plan, which led to the boredom that led to an expansion to Layout Version 2. I have been working on Version 3 for some time (which includes the addition of a tram line, the removal of the depressed section and expansion of the city, a viaduct, and an extension for a large passenger terminal). I hope that there will be no need for a "Version 4", but as the below photos are compared with my later work, it becomes apparent that the evolution of my layout is improving over time!
Miller Engineering to bend so that it would make a nice round (and large) marquee over the entrance. The instructions from Miller Engineering state very clearly this should not be done, but I got it to work. Unfortunately, its stopped working since this building was removed from the layout for Version 3 work.
modifications since this photo was taken.
As I recall, I put together this layout fairly quickly. Unfortunately, in some areas it shows! On the other hand, it was no problem to remove the Unitrack and reuse it in other areas for Version 2. This flexibility is also a curse, as it makes it more difficult to finally make that choice and do some final ballasting and detailing in case another revision is planned for a later date!