This is the end of the days work. The trailer supports its own weight and is already pretty darn strong. When the indentical roof spars are placed into the notches on the curved front of the trailer, the entire construction is braced, reinforced, squared and plumb. I am glad I decided to notch the spars. I feel like I've got a firm foundation upon which to build. The aluminum skin will hide the notches in the sidewalls.