While I've been known to tackle a project just to see if it was possible, I have serious reservations about this one. It looks from the photos as if large sections of the hull have been crushed and have just had fiberglass mat and resin slathered over them to hold the thing together. It appears that you would essentially be completely replacing much of the boat. Before doing anything else, I would sand off all of the finish layers so you can see if there is anything structural underneath that's undamaged.
If you can manage the sand it to a fair shape, you'll essentially have a form that you can laminate multiple layers of glass cloth (woven cloth, not mat) to the outside of, to provide structural strength. Once that's done, you can sand away any protruding bits inside and add internal reinforcement where necessary.
In the end, the original boat becomes a core for the new structural layers. Add a coat or two of paint and it's done.
The strongest way to do this would be with glass and epoxy resin, but for the amount that you're going to need, polyester resin is a lot cheaper and it cures faster. It's also better if you're not going to be able to do all of the exterior layers at the same time.
4-place Boat Trailer
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