I'm a little behind in the updates. I made it back to the tree house in November of 2008 for a short visit.
I didn't accomplish much in terms of progress, but I did manage to spend every night in the tree house. The temperature dipped into the low teens which made for some chilly evenings.
No mice had made it in, which was a relief. There were a few dead bugs here and there, but for the most part everything was exactly as I had left it in the summer. While cleaning up, water from the washcloth I was using would freeze on the counter. It made the idea of insulating the place and installing a heat source more attractive.
Even though the Sycamore tree that the structure is in is old, it's still growing at a fairly impressive rate. It's starting to grow around the washers on the anchor points a bit. It will be interesting to watch the tree get closer to the eye of the bolt.