I really have to admit, that's pretty amazing. However, as much as I don't want to admit it it's very unlikely that this sort of development would work for any area besides small rural, or even suburban areas, despite the economical and cost benefits. If this sort of idea was to be proposed for a big city lifestyle, it would be hit with several obstacles.
However, due to the fact that I, personally, live in a suburban area I have to say that I really do think it's a fantastic idea. It's economically-friendly, cost-friendly (and everyone's wallet's and bank accounts would surely thank them!) and the fact that it would provide A solution to the expensive housing market, and not to mention decrease the amount of time it would take someone to pay off their mortgage (compare $500,000 to $70,000).
However, like I said, unfortunately I don't see big-city individuals taking a big leap of faith in the concept of the eco-home.