I put water into the tank and started cutting with a (power saw) sawzal, got it opened enough to see the 1st baffle, this is not going to be easy. I remeasured the hole and the deck plate, I think if I cut 1/2" on each side, I will still have plenty of support to replace the deck panel and good support.
All the deck screws are totally loose, any idea of how to repair them? Maybe epoxy and re drill the holes? I know the caulking holds the plate in place, but would be nice to keep the salt water out as I know it would seep through the screws.