S. Bingham:
Consult your panel company about nail base panel attachment needs. It could work.....
Depending on your roofing material specs you may be able to apply over felt over nail base.
If this complys with roofing shingle warranties that's good, if not you may have to build up a "cold roof" with a spacer and another layer of osb or some other sheet material and then create the roof.
You'll have to pick a panel company and get some details directly from them....
Good luck with your project.

Jim Rogers


Whatever you do, have fun doing it!