[Iron Munro]

In Madison Wisconsin?

I would bet these are not in compliance with zoning requirements and building codes.

Imagine the fun you would have with the zoning board and building inspector if you tried to build something like that for human habitation in most cities.

[Kackikat]

http://www.designboom.com/contemporary/tiny_houses2.html

The zoning and building codes do not apply to houses on wheels, hence RVs.