The second rule is, the children should be involved. The building of a treehouse was an important selling point when we told our sons we were moving out of the big-hearted, exciting municipality to a sleepy rural township. I still have our older son's hand-drawn plans for what he wanted it to look like.( It's close .) And they both drove some tacks and bolts and noted some cool limbs that we incorporated into the design. They participated.
The last-place rule is, it's not gonna end up the space you think it's gonna end up. Meaning: The programme will change as "theres going". New themes will form once you're up in that tree. And other ideas will prove undoable. Divisions will get in the way, and things were normally search different from the air. Even a few feet up. So improvise. Adapt. Make it yours. Or, to be more precise: Make it your children '.