I'm currently working on my N Scale layout on a door as well. I like what this hobbyist has done. It looks sweet. I'm also modeling inspired by a city in western Maryland. For me, I've driven past Cumberland for years and always felt the main street visible from the highway was beautiful and ripe for modeling. My era will be the 1950s-1960s roughly (i.e., there are more 1950s autos available than 1960s so I'm extending into two decades). Thanks for the inspiration David Betz!
My layout is in its very early stages, with benchwork under the door now: https://jsbrookspresents.blogspot.com/2017/07/hobby-time-putting-legs-under-door.html
For examples of my modeling, see: https://jsbrookspresents.blogspot.com/2017/05/hobby-time-n-scale-model-by-gloor-craft.html and https://jsbrookspresents.blogspot.com/2017/04/hobby-time-n-scale-modeling.html