Don’t use too many fasteners. This gives the tree room to move and grow. Even for smaller, lighter tree houses where the load is spread over three or four attachment points, consider using or lag bolts.
Bluebird Treehouse The Zip Line Ride take-off is from the deck. The long cable is anchor high above to the tree and the other end of the cable is secured to a tree. Oh come on it has a zipline seat, a ZIPLINE seat, how cool!