So my house is from the 1950s built in soviet times from whatever they got their hands on. It's in a quiet seaside inner suburb of a baltic capital. The house

So my house is from the 1950s built in soviet times from whatever they got their hands on. It's in a quiet seaside inner suburb of a baltic capital. The house is built from wooden railway sleepers arranged vertically, the whole outer wall are those beams next to each other. Structurally I guess much superior to any 2x4. There was some insulation added in the 90s but it is still crap. My choices here are: 1. spend a lot of money to redo insulation, change the windows change all the floors, completely redo heating and the result is still a smallish impractical and frankly ugly house inside and out. 2. tear the whole thing down, recycle the materials and build a truly modern, beautiful, practical, energy generating passivhaus. Will cost more, for sure. 3. sell the thing and try to find a similarly good plot and build on it.