Work in progress on the base for my mech model. I have tried to give the base an 'industrial wasteland' feel - broken machines, rubble etc. Diameter is 180mm. Cut out from 3mm MDF sheet, the offcuts being used to add height to the terrain on the base. I built up this rubble terrain using first scrunched up tin foil (to bulk out the voids), then a skimmed layer of automotive body filler, which was textured before it had fully gone off, then sanded down slightly to remove the sharper edges.