It might be a tad "underbuilt" if you plan to run prototype, 12" to the foot scale, trains over it, but it will support any model trains from Z-scale up to live steam scales! Given the, shall we say "significantly robust" structure you have built, plywood is not necessary. A sheet of extruded foam 1"-2" thick will be fine as a layout base. You could do the mountain thing in one corner, but both? Won't that look a little too convenient? Maybe one corner could be a very tall building, instead of a mountain?Agh yes I thought to curve the corners but the plan is to have mountains that go up to the corners. but I may still curve them. Do you think I need the plywood? Or just use the 2” foam?
OVERBUILT!?!!! I was worried it wasn't built enough lol.
Or, better yet, curve the sky.
You can add the curves on top of the existing backdrops if that's easier. Use 1/8" MDF board instead of the (I think tempered, from the color) Masonite. MDF (Medium Density Fiberboard) is available at Home Depot, Lowes, etc. Sometimes called "hardboard."
It is porous, and warps very easily. Much more easily than tempered Masonite. You'll need two square pieces, the same height as your present backdrop. Before soaking them, sand the two sides that will mate to your Masonite panels at a 30-45 degree angle. This, when butted to the existing backdrop, will minimize the joint line between them. Adding some drywall mud can make the joint all but invisible. Warp the two "curved corner" MDF squares and clamp them into place while they are still wet. Use rope, full paint cans, clamps, or whatever, to hold them in the curved shape until they dry overnight. Then glue the joints, clamp again, and add the mud, and paint as needed.
Traction Fan 🙂