Update: Craig sez, "Thought I'd mention an article I wrote about Tumbleweed and some other tiny house companies that was published in the Chicago Tribune, Providence Journal, Arizona Republic, and some other papers. There's a woman who's building them as temporary homes for people whose houses were destroyed during Katrina."
Jeff sez, "looks like they sell plans, not houses; and make extravagant copyright demands:"
All of the designs are copyright of Tumbleweed Tiny House Company. A full set of plans must be purchased for each structure built. The construction of any design from Tumbleweed Tiny House Company without a purchased set of plans for that particular project is a violation of federal copyright law.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.