The layout will eventually live in the sitting room, so it has to be discrete. For this reason I've designed it to fold away into a sideboard sized unit. There's still a significant amount of design work to specify the lifting mechanisms, but I'll wait until I have a feel for how heavy the boards are going to be before doing this. The importance of doing the space model shown in the pictures below was to assess what baseboard size and shape I could fit in the room. This then played chicken and egg a bit with the layout track plan until I arrived at the design shown here. There is space for approximately 250mm height for each layer (including baseboard thickness of 40mm) - so I'm not going to be having any tower blocks, but a medium sized village church should be feasible.

From this model I was then able to finalise the track plan and to cut the doors to size.