Lars,
I commend you for using your design expertise to aid those effected by the tsunami...
As this thread started me thinking about the scenario and the problems we experienced from the hurricanes that hit Florida, several things came to mind...
I think first and foremost, temporary housing for large numbers of people would have to be collapsable and easily transported. In addition, it should not be cost or tooling prohibitive for an established manufacturer to "ramp-up", in preparation of production. There must be an intermediate solution to a pop-up tent and a mobile home. One is not enough and the other is too much.
I would think that a system of hinged panels, creating a dome structure (similar to an igloo) could be easily manufactured and collapsed for transportation. Ofcourse, this would not include appliances, however... there are portable versions of the same commercially available that may prove suitable to include as a part of a kit.
I hope others will chime-in on this thread with suggestions that could prove beneficial...