Within the next 6 weeks I should be applying canvas to the outside of my Foamie. Unlike most of you guys building TD's. My Foamie is a TTT. The exterior of the cabin is 116" long x 76" wide X 74" tall,then and add 12" from the ground level. I've got a good grasp of doing the canvas work (since I did the interior wall before assembly) . But I'm not sure of how to do the canvas work on the roof.

. My XPS foam is 2" and I do have some 2x2's for roof load supports. But I have not really come up with a good plan to apply the canvas on top of my tall camper. I really don't want to try to lay on the roof, to apply my canvas, if I don't have to.
I" m up for any comments ...Thanks