Leon, Not totaled, but there is some work ahead of you. I think you may even need to remove or at least loosen up the rub rails on both side to get to the damaged material to grind it all out. You first need to grind away all the damaged material and hopefully get to some quality base material before going through the hull. If not, you will have to play it by ear as you rebuild.
Build it up with layer after layer of 1708 fiberglass and polyester resin would be my suggestion. It really isn't hard to do, only time consuming. And once you get the hang of working with fiberglass and resin, it even can be fun as well. I would suggest to use non-waxed layers of 1708 fiberglass and laminating polyester resins. Don't go waxed resins or you will have to sand between ever coat or it won't stick to each other. So that precluded the usual Bondo type auto store resins.
Look around your area for a fiberglass auto repair type shop or a marine repair place to get the materials. JMHO!