I've been thinking a good bit about building myself one of these. I like the idea of being able to own a home for around $10,000-$15,000, possibly much cheaper if I used found materials wherever possible. I also like the idea of being able to pick up and move on a whim, even if it's only to another abandoned logging road a few miles away. Consumption of resources would be minimal, it could be heated and powered by the sun on most days. Using a diesel truck, I could also fuel it with minimal impact on the environment, using biodiesel/vegetable oil.
Does anyone have any experience with this sort of thing?