Thanks to the help from some good friends, I finally got to see my design come to life today. We made major progress. All walls and roof framing in place and some of the exterior sheathing too. And, the best news, it looks like this thing is actually going to work. Once we got everything up, glued and screwed together the entire structure became rigid and strong. The neighbors, especially those who slow down as they're driving past, must think I'm nuts! Hopefully next weekend I'll find time to get the loft installed, and finish the sheathing.