Since there was interest in what was in the tree, I found a close-up of the tree house. Now that I think of it, the neighbor kids borrowed tools from us, and asked for nails to build this a few years ago. We couldn't see it from our yard, so I don't know how they got it up there. It sure is up high!
If you look closely at the second photo in the previous SWF post, you'll see the treehouse is in it, too.