"Basic and Excellent"
My kids and I had a blast building our tree house. It's a memory we'll hang onto forever. And I'm guessing the tree house will last nearly as long as the memories!
Relying heavily upon this book, we designed and built an extremely sturdy and FUN tree house. The basic drawings, pictures, and instructions in the book provided this amateur with the necessary guidance to erect something that was not only FUNctional, but also safe enough for my kids to play on! ;-)
If you're looking to build a tree house, and you're not a master carpenter, I recommend this book!