Cutting the side port lights in a Dix470 DIY catamaran.

In this video, I cut the holes for the inserts that will eventually hold the Vetus port lights. I will also glue the inserts in place. I have had some trouble with my GoPro getting a card error and I end up losing all that I have filmed. This has happened a few times now, even after replacing the SD card, if anyone has had any similar issues and knows a fix I would love to hear from you.