As for wooden houses, Phrae(?) seems to be the place, not teak, but a "flat pack" they will build pretty much anywhere for about 800k up. No kitchen/bathroom. Seen some examples where these have been added on concrete pillars at the "end" of the wooden house. All from different sites. Sadly the Co's don't appear to have websites unless someone here knows otherwise?
Obvious advantage? Fall out with the missus if built on her land, just pack it up and build elsewhere!

I read that somewhere else as well.

Still, its good fun researching. Would love to buy a couple of Rai upcountry and build and have fruit trees, the lot, on the land.
But I'll probaly end up with a concrete pile somewhere!
Still, next time I'm there, I can research in earnest!!!