Very unusual. Is it durable?

A couple more pics.

Great form composition, but not sure about water drainage, looks like there is a butterfly roof.

Thanks! Yes, the butterfly roof has a cricket that drains the water into the gutter, then to the rain chain. It will eventually drain into a water tank at the bottom, and helps maximize water collection from the roof. I the attached photo, you can see the butterfly roof to the back of the house.

The view from the unfinished upstairs master suite.