I´m trying to restore my 1970s sunfish and I´m worried of past water damage, as I have no idea what it´s been through in the past. I´m contemplating adding a view port so that I can look inside and check it out, but I´m afraid of messing up or damaging the deck. I also want to add a drain plug to get rid of any water that may get into the hull during times to come. I´ve seen them in the back of the boat near where the rudder attaches, as well as on the side of the deck. Is this needed? And if so, where is the best place for it?