After installing the sheathing on the outside of the body, and assembling the cupola, I assembled the roof.  Again I was amazed at the precision of the parts and the limited prep-work they needed.

As you can see in the picture I had to improvise a little bit to hold the parts together while the glue was drying.

I had to improvise again when assembling the main portion of the roof.  In order to make the roof curve to match the frame I glued one side and then clamped it and glued the other side.  I tried using clamps at first, but they tended to shift parts around; using a nearby box of tools provided a flat surface and enough weight to hold the parts while the glue dried.