My buddy is building a wrecked Cole T deck, he actually got Cole to send him the whole corner of the boat fresh from the mold, I think it cost him like $400, actually now that I think about it, I'm going to ask him if I can take a couple of pictures of that thing, he's very talented...
I would block it on the outside then beef it up on the inside after grinding all of the effected surfaces, then use some light matt, not roving, and cover the area around the damage, use lam. resin for this (no wax) if you don't like the epoxy stuff (I do) then get some strips of the Criss-Cross woven roving and cover up all the newly bonded areas, you will need to "pre-wet" the roving to get a good bond, use a roving roller to get out the exess air.
Once this cures you can make the cosmetic repairs on the outside without compromising the shape of the hull.
Its easier to say than do
GT