One board after another

As if the end of school and the start of vacation time weren't enough to keep me busy, I started building a tree house in my back yard. Both my wife and my neighbor Dan have had great fun skewering me for proceeding without plans. Like everything else I do I'm making it up as I go. I can't see where the last board will go. But I know where the next one belongs, and I'll put it there eventually. Will I ever finish? Do any of us?