Just a platform, now. Like I said, we're going back up in two weeks with recycled building materials from the city. There will be another story, so about 200 sq. ft.. We used lag bolts to attatch the frame, with extra space to allow the trees to grow. We will be adding a suspension cable to reinforce the corners. Our plans are already evolving but most likely it will be our summer living space, we'll do something different for our winter space, but we plan on doing at least some planning for passive solar heat (it gets lots of morning sun). Other than that, it depends: We may have a small wood-burning stove, or in the meantime, just use a portable propane catalytic heater.
[Edited on May 31, 2005 5:25PM]