Brilliant! And smooth abd clean. Saw it on Boing. I helped build a dome in the late 60's. I think it ended up like your total utter failure - but I was gone by then. I like the idea of using such a thing as a (flat) roof-top shelter on a garage or something (me downtowner). And I'm highly amused that all the commentary I had the stamina to scan was about housing prices and nothing about structure. cheers, Good Luck, Tedsy