I finished up the Kastor a few days ago so here’s the pics of the finished build-up. Overall it went together very well, especially considering it was a preproduction sample. The base is plaster poured thin over plywood then stained with AK-Interactive products. Weeds are silflor horsehair foliage and fine turf. Rubble is plastic shape scraps, plaster scrap embedded with steel wire then broken for the rebar look, and ballast/talus.
You can purchase the Kastor when it comes back for 2nd Edition preorder in a few months at Industria Mechanika.