Need repair solution verification for leaking cracks in hull

[Over30S130]

I have been searching around this site and this is what I have come up with. I have two 6" cracks in the middle of my hull right at each rib line on either side of the keel center line-in other words not located in a relatively flat part of the hull, but in the crease of a hull line. I re-exposed the inside of the hull by removing the deck patch from previous owner. I found that the two center stringers that form the center tunnel cavity were completely gone-removed in previous repair. The only thing left was the outside laminite of each center stringer which holds the foam to the outside stringers. I'm thinking that this lack of support caused the hull to flex too much when encountering the oncoming wake damage. Was going to remove this and rest of foam to see what the outside stringers looked like and to open up the hull area some more so I could see better what I was up against. Was thinking of just sanding off all old repair and wipe with acetone and then apply a sheet of 1.5oz. mat and 18oz. or 24oz. woven roving big enough to cover the two cracks and futher strengthen the hull as well. Then lay in my new stingers using the same two layers. Will this work for the crack repair? Also what layers will need to go on top of the repalcement whole in deck to weatherproof and strenghten deck repair hole? In addition, there is some shotty single layer glass and resin to the bottomside gel coat which is peeling. whould I just need to sand all this repair off as all the repair would be on the inside now and if so, what would I use to repair the sanding damage and cracks on the bottom gel coat. What would be the best resin for this job-epoxy or poly? Any suggestions to this proposed repair will definitely be considered.