Updated and finished version. Base and structures built from high density foamboard, roofs made of cardboard covered in abs plastic; surveillance cameras, made from thin cardboard covered with foamy and abs plastic. The grating is a common grid from the hardware store, it was also covered in abs plastic to avoid "accidents" with the sharped edges. For grass I used broom fibers. "walker" figure was a fast sculpt made with hot glue, the face was then shaped with epoxy clay