Peter, You are better stocked than any O gauge train store.
Nice work there Arnold, I totally agree. One of my favorite benchwork jobs used this around the wall mural from Backdrop Warehouse:
This was a N&W logging branch line.
The Virginia Creeper along the Abingdon VA line. The 40" high bench work with a 36" tall mural and coved corners brings you totally unto the setting when you are standing in the aisle walking your train from town to town. Very immersing.
Always try to get the backdrop installed before the bench work. Otherwise it is a back breaking job.