Step 35: Attach exterior layer of roof.
Again one piece won't stretch the entire distance. Trim the first sheet so it ends midway on one of the spars. Then cut another piece to fit from the spar back to the tripled up spar where the hurricaine hinge will go.
I had some trouble getting the sheet to lay right along the tripled up spar so I ended up using a lot of little nails to keep it in place until the hinge was screwed in place. See the next step.