Here are a few pictures of a last minute showpiece we came up for Tactica last weekend. Actually, it was started on a whim about a week before the show, and I never imagined that we were able to produce something showable in that timeframe

I have not yet made pictures of the whole thing, but here are a few construction pictures.
Underconstruction is Styrodur, covered with mattress foam, covered in turn with PVA and fine sand.

The foam material had to be held in place with toothpicks while the glue was drying (hence the project name. The actual vegetation is more tropical). I recommend gloves for pushing these in - those Chinese torturers knew full well what can be achieved with bamboo splinters.

Front and back view of the already painted rock.
Shanty attached to the rock face. By now, there are plenty more, connected with ladders and walkways.

Pipeline to feed the machinery inside the cave.

Now for the dilemma: I have absolutely no idea what to do with it in the end

The idea is to make this into a gaming table, consisting of three to four of those rock islands, all of them interconnected by walkways or suspension bridges. It will be definitely post-apoc (or at least sufficiently backwater to justify the rusty shanties). I could imaginge a pirate or smuggler outpost of some kind, or a trading post, but it could also be a last resort on a zombie- or mutant infested world. Other suggestions would be highly appreciated.