probley mega expensive though.... wow

It's an interesting design.
I though about the potential of using a round form like that when I was exploring a local steel yard and saw some huge steel tanks that had had the ends cut out in "doorway" shapes. You could walk upright easily in them - I had less headroom in an old attic room that I lived in once.

The site is remarkably well documented, definitely worth a full-read.

I definitely disagree with some of his methods, like using straw as insulation, and yes, the green wood SA...although it appears as if he has also made extensive use of deadwood.

Overall, I like the design, and the organic lines of natural improvisation between his design mission and his available materials...he has a great aesthetic sense. But from an engineering standpoint, I honestly don't expect that house to last a full decade, if it rains or snows where he lives.

But, given better materials and more stout engineering, it appears quite doable to engineer a fifty-plus-year structure...and of course, for someone not afraid of welding, steel tube and sealing paint, the possibilities are nearly endless...