Thanks for the compliments!
I've been working on it as much as I can since I last posted, the top is now painted inside & out
Inside before -
Scuff & Spray - I left the texture on the inside, which unfortunately meant leaving some of the cracks along the edges since I couldn't figure out a good way to fix them and keep the texture (they're just cracks in the original coating where the parts are joined together)
after - well - it's still white, but it's clean looking and coated with a satin clear coat
For the outside I smoothed the factory seams with fiberglass and sprayed a black with a satin clear coat. Not perfect - I'd never sprayed satin before, so I'll probably end up redoing it at some point, but unless you're 7' tall you can't see the top of the roof anyhow.
Basically the problem was because I had it supported too high and couldn't easily reach the middle section of the roof to get a consistent pass on the clear coat. The satin clear needs to be applied very consistently to get an even finish, so in the very center of the roof there are a couple of stipes where the gloss doesn't exactly match.