Looks great so far. The lighting might be bright enough - I didn't have as many drop lights and ended up having to add a couple of LED strips hidden in the rafters. Best to check before final assembly.
I didn't use a base - I wanted it to be free-standing right onto my layout top. After the flooring was fit and glued in place, I inserted thin rods all around the perimeter base of the roundhouse into the floor and patched and painted over the holes. I did the same at the top of the corners where the sections meet That provided enough structural rigidity so that the RH can be lifted and placed w/o having to use a base.
I detailed the interior of mine with figures and detail parts (pulleys, tools, etc.) and was disappointed that the black roof prevented a lot of that detail from being viewed. Although obviously not proto-typical, I ended up tracing the assembled roofs and cut them out of clear lucite and am very pleased with the results. Just an option to consider.
