I made this wall out of the purple window foam from Home Depot. Cut to size, used toothpicks & Elmers White Glue to hold together. Once dry I added wall putty & left "ruff". Used several tones of brown to simulate dirt & sand. Small Lego piece & wire for the control panal. There are pegs in the back wall to hold the SDCC HiC to give it the illusion of floating. For this pic I used a resin copy of Han "defrosting".