[Hugh R]

I built mine as a "floating" tree house. By that I mean I have a piece of 2"x4" lagged into each tree branch and the floor frame sits on top of the 2"x4" with a long lag into it rather than the tree. Trees for the most part grow from the top, not the bottom. The California Live Oak that I put it in has a total of three lags into the three branch trunks. 10 years later, the tree house is still perfectly level. It's the "Eco" way to go, and it works well. The steel studs (wall and roof joists) must have shaved several hundred pounds of the weight. They're cheaper too. I spend $750 on that puppy ten years ago. It's hard to see, but it has screens on the windows, and the area under the gables, front and rear, are also screened.