I cannot help you with the repair, but I can share your misery. I had simular toerail damage on my Oceanis 400. Popped the rivets holding the toerail in the hull, bent the rear gate support, broke a stanchion, and a couple of other items. I am looking at getting someone professional to do the repair. Access to the bottom of the fastners is not easy. Will be interested in any replies on how to do the repair.