I used cedar for my stringers, and I tried to pick out the lightest ones (maybe not the best thing for this application). Your pine stringers are probably a lot stiffer than WRC.

Bill

: I had not thought about that, good point. At this point it would br simple
: enough to add an intermediate framing. Attach it to the coaming and the
: floor maybe?

: Just went down there and grabbed the frames and tried to flex them. I had to
: pull hard! Stronger than I expected. I used pine for the stringers because
: I couldn't find decent cedar. But I still think it's not a bad idea to add
: some support there. I need something under the coaming anyway so it should
: be simple enough to tie the support into the flooring boards? Will have to
: think on that one a little bit.

: Thanks.