It measures 8" by 4' (5 1/2" including the stairway), and 5" to the top of the dome. As usual construction is foamcore and card, with spackle serving as adobe rendering. The stairs are Hirst Arts components.
I made the roof for the second storey removable using a section of corrugated cardboard laminated with a thinner sheet of card. It works, although another time I think I'll use thick poster board. The dome itself is a 2" polystyrene Christmas ornament cut in half. Access to the lower floor is gained by lifting the whole thing up and popping in the figures.