Here's a link to the people who have built
Sunfish for the last many years. Located in Portsmouth, RI. They also build
Laser and a few other popular small sailboats. You can also see PRICES of new boats just for curiousity.
http://watercraftportal.com/db_clients/30.php
If you are getting water in the hull, the first place I would look would be the hull to deck joint. I would turn the hull upside down and have a close look at the hull to deck joint (under the rub rail) for cracks running fore and aft. If the boat has ever made a
Hard Landing next to a dock you may see an indentation in the rubrail at the point of impact..which may have caused a crack where water could enter the hull when the boat is dragging the rail in the water under sail. NB