Web, DO NOT JUDGE, I filled them with the almighty JB weld water weld putty
. I spent all week long pondering on how much work I did not want to do on filling 6 non important holes. I almost talked myself out of filling them at all. I got the JB weld, hit the holes from top and bottom, let cure, scraped, sanded a little and painted. If they don't hold, I'm not out anything.
And yes, having free reign of my shop at work is awesome. It is also where the boat will be permanently stored.