Wall was built by taping .06” x .06’ strips together then cutting them all at once. The strips I used were store bought but could be cut on laser. If you leave the tape on the inside it will create a flexible wall. Line up the wall by placing it in the gap between the two floor sections. I also used a store bought chain and ladder but sewing thread could be used for the railing and the ladder could be cut on laser. For the roof, “Kiss Cut” (cut 80% deep on material) so it can be folded in one piece. Then attach the two ends together with tape before glueing on.
The tree was made from a balsa wood dowel (textured with wire brush), kabab stick, air filter, and colored foam attached with hair spray. There are many You Tube videos on how to make them but this guy is the best.
I see some major temptation to jump from the lower treehouse into the water, but I can’t tell if there is a good way to climb back up out of the water…