wow...way cool. Definitely a good brainstorm idea here. Tracy on the other topic did make some good points as far as what happens to the tree once the house is made, and will the house grow out of proportions over time and such.
As far as what it would mean for industrialization taking over our natural wooded areas, it's awesome. Would be great if in the future this idea could become a reality because at the rate we're going, there won't be anything left but concrete to look at.