I recently acquired a mid-seventies Sunfish which sat outside under trees for fifteen years. It is my first experience with a Sunfish. The hull is in nice shape, but I am in the process of refinishing it with Interlux epoxy. I would like to remove the coaming which looks like it is held on by pop rivets. Am I correct, and can I just drill them out and replace them after I spray the hull? Also, there are three holes on the coaming that are empty. Two are on the ends and one in the center........what was there? Thanks for the info!