Great to see the construction details, which reminds me of things I did a very long time ago.
I agree with others that your graphics set a new level for design presentation. My original layout lay 'fallow' for rather a long time and, to prevent damage, I boxed it in with an overall lid. The sides of this box subsequently provided the opportunity to add backscenes that were automatically higher than the highest parts of the layout. I even have an easily removable transparent front, so that I can 'safely' demonstrate operations to a 3 year-old Grandson