Re: Stringer Pushing through bottom of Boat?
That pic looks like a concentrated load in a very small spot, most fuel tanks have either a flat bottom, or a v shaped bottom to fit in the very bottom of the hull. So it's hard to see how that caused the damage, especially if it's a plastic tank which many boats use now. Somehow a really heavy load was concentrated in one spot, or the hull lay-up wasn't done right in that area.
I would ask if you can see what the hull looks like on the inside, after they remove the tank, to see what actually caused that damage. I don't know if a dealer has 'glass men talented enough to fix that. I have seen damage like that fixed before, by a very good local shop, but these guys are pros and do this all the time.
Here's another question, does the boat have a hatch, that the tank can be removed through, or does the deck have to be cut to remove the tank? If they have to cut, you may not like what it looks like when they piece it back together. My old FW had a hatch to remove the tank through, which I duplicated in the rebuild, and I made the framework around the tank much stronger than what was originally there. In this pic you can see the darker colored framework (mahagony sealed with epoxy) which was used to secure the tank to the main stringers, the original work was a series of 1 by 2s with a wood screws driven into the old stringers. When I decided to rebuild it, I found that 3 of the 4 mounts were pretty rotted, but the tank hadn't started moving around yet!