Here's another long-distance entry for the Solar Decathlon 2009: Team Spain's The Black and White House.
According to their site:
The major concept of the House is to be transportable and easy to build all over the world.
The prototype of The B&W House was therefore conceived as a modular plan made up of nine squares[.] For transport and assembly purposes, the house has been divided Into three mobile units.
Worth a look: