I considered that but, being there is no wood where the stringers were and just empty glass tubes, I'm worried it wouldn't be strong enough. My plan here and if I'm wrong somebody please stop me before I spend money I don't have, is to cut out the old glass cut new stringers and girders and bulkheads and glass them all back in. The original stringers where or looked to have been 2by's and the girders 1 by's can I replace it with a couple of pieces of ply? Like tsubaki said, I have a pretty clean slate and am drawing and thinking before I go grinding away. I do thank all of you for all and any help.