Wow, Okie, that stringer pic is a thing of beauty!
I agree 100% on not attaching anything with screws in order to maintain the "waterproof" seal created by the fiberglass. I plan to do something very similar, although I'm not sure if mine will come out as ncie as yours lol.
So this weekend went pretty much as planned in terms of getting the outer stringers glassed in, although wasn't able to make any headway on the inner's. Looks like that will be next weekend, or the following weekends project.
Managed to go through 3/4's of a 5 Gal pail of resin in the process.