Mike, thanks for the help. As it is, the decks do still mount on to the small remaining lip so I may be able to epoxy the hull to deck without building the lip all around.

For the cracks I started by removing the fiberglass cloth at the cracks around on in and then filling with thickenned epoxy, 1 in strip of fiberglass tape, then two and a 3 in over the previous two. Then two layers of cloth and it seems pretty sturdy.