I very recently cut out an inspection port hole on the interior of my Sunfish's cockpit area. Although I was more than a little nervous beforehand, it worked out just fine with a rotozip saw. I did have somewhat of a hard time creating a depression or dimple for the saw to initially catch to make the first cut through the boat--I ended up using a center punch, which I had to hit pretty hard to make a dimple. Although this essentially worked, in retrospect I'm thinking this wasn't the greatest idea in the world since the fiberglass could have cracked. Now that I have to drill six screws in to affix the inspection port, I'm wondering how I'm going to do it. I haven't drilled screws into fiberglass before, but it seems like getting the screw or even a drill bit to catch on such a slippery surface is going to be tough. Do people in the forum use a very thin drill bit to make an initial hole/dimple? Once I can create even a tiny hole, it seems like I should be home free.....