This diorama represents a vast hall of the castle grayskull. to tailor it to use styrofoam walls and floor, the door and windows are made of polifan, to which I gave way to the cutter presicion and a soldering pencil. the colomnas are corrugated cardboard (in the center put a Styrofoam bar for stability) then paint with acrylics at ease. Try not to overfill the space to put many figures, building size diorama.