>>63900596
So house walls you want them as thick as possible walls. Noise, thermal battery/insulation protection.
The design be simple and form follows function, slanted for rainwater collection, in the best case a green roof, or at least strong enough to hold ivy or just cut material/camo nets. Again insulation is important heat is visible hard reflective stuff too.
many things work wood rammed earth concrete ICF, Stone and brick all fine. the design should blend in and not just be a square box. use steel beams since they cant be melted by jet fuel and because you can slat in wood planks to separate rooms or to add sheltered space. Your patio can become an extra Room in a few days if you just wall it up like a retention wall. everything should be Passive don't trust a pump for drainage or air circulation build a moat. Passive low energy is better than a high-powered oven/stove. Function by material and shape is better than glues or paints, stone shingles will last 100 years, painted metal ? Plastic will UV degrade. it's ok and cheap, but glass will last forever.
A reed roof is waterproof by design and shape, not by material.
Again use grass pavers, if you stop mowing your access road will be hidden below a meadow soon.
The design should be suitable for guest and safe! Have the option of separate living area without being unfriendly, the ornamental door to the second floor just happens to be very sturdy.
Plan for removable window bars. Have an entrance you can use like an air lock. Cleaning rooms, options to live separately to quarantine.