Lots of questions on the magic building material I mentioned at the end. It's called arbolite. Another example of crazy Soviet engineering that deserves a second look. 5 buckets of wood chip to 2 kilos of cement, 2 kilos of stone dust (from making crushed stone), just enough water to wet it through, liquid soap enough to break surface tension, any one or several of a number of common chemicals to bind the sugars in wood that interfere with cement curing. Mix, pour, tamp down. Looks ugly (but holds plaster beautifully, preferably sawdust plaster with some lime and just a bit of cement), has thermal characteristics very close to those of solid wood, a specific weight of around 0,7 (so it floats), doesn't burn or rot, nothing will eat it, strong enough to hold up 3 floors and a roof. Not a good material for taller buildings unless a frame is used. Great filler for post-beam-and-filler (e.g., Fachwerk) architecture. Except for cement the materials are all free (better than free if you get paid to haul them away). Can be drilled and sawed easily, holds nails. Unlike brick and other types of masonry, doesn't crack and can take a ridiculous amount of distortion before failing. Sledgehammer blows produce a dull thud and make it shrug. Great stuff, highly recommended. A total redneck lifehack (don't repeat that too loudly!). Email me if you want to give it a try.