Solar panels on a bubble roof?

I wouldn't build anything out of wood. Aluminum and stainless steel hardware. I would look for the main ribs or other structure that may have been incorporated to give it rigidity. I have used pieces of the white plastic lumber that they sell at HD. It's also going to be a little heavy but you may be able to use it in some key areas as it's very workable. It finishes real well with a table saw or router and may be able to be shaped to the roof for a rib effect.

Use Dicor self leveling or non self leveling sealer on the roof. Do not use silicone.