The kids finally got me to start brainstorming a 2 story single tree treehouse. I've skimmed a few books and looked around the google. But one question I can't find an answer to- the tree will run through the center of the house and up the roof. My concern/question would be can i attach the roof to the tree as well? I can design it both ways, but not sure if its best to let it float for when the tree stretches and sways in the wind.