The images below show the detail of the base prior to painting. The steps are made of foam core, I made small hummocks out of poly filler; this was then covered in a mix of sharp sand, gravel and small stones. To add a little more detail I have included a discarded coil of barbed wire (I don't recall the manufacturer) and a couple of girders cut from lengths of plastic girder from a model railway store. The following pictures show the final painted base. The whole thing was base coated in Burnt chocolate Weatherex masonary paint. This was then dry brushed with Citadel Graveyard Earth and Bleached Bone.