Thanks for the welcome!
Ive seen a few other interiors for this model, they are all neat. I have one pic in there where i show the framing for the floor plate, it has a technic border that locks back to the top frame with vertical beams. Its as strong as it can be without interconnecting the top edges in some way, which would make it harder to use as a playset. Ive had to flip it over a number of times and it seems very sturdy.
Trying to figure out how to make the cargo elevator right now, im thinking some kind of telescoping thing.