I have done quite a bit of fiberglass stuff over the years. That hole should not be any problem at all to have fixed, provided you get competent people involved.

You need to factor in the cost of a repaint too. If that boat has black gelcoat that is anything other than factory-new, you will never get the repair patched in without being able to see it. However, if you repaint after the repair the boat will look like new.

Tom