Having dome a lot of work with Ntrak modules, I would say 30" by 60" or 3' x 4' are reasonable to carry and will fit in almost any hatchback/minivan/SUV/crossover. This size reange gives plenty of room for several scenes in N scale
I had a module set consisting of three 30" x 48" units that stacked for transport- very lightweight construction, but bulky. Legs can be folding or removable for transport, or set up to sit on a table.
As for scenic dividers, I might lean toward high scenery in the middle - grove of trees, cliff, bridge or row of buildings - rather than a backdrop down the center.? Backdrop could be movable for photo purposes.
Are you leaning more towards rural, industrial, small town, city, logging/mining, dockside, or some mix of these?
-ArtP
