Here's the original keel trunk in Redwing, hull #266, a 1985 Potter 19 built back when Joe Edwards owned the company. The walls were only 1/4" to 3/8" thick most of the way down, and only a little bit thicker at the bottom near the hull. It was the worst keel trunk I've ever seen on any P19 -- and I've seen at least 30 P19's! It was so flimsy it wiggled when the boat heeled. Nevertheless, it had made it through thousands of miles on the water and literally hundreds of groundings. The new ones built when Intenational Marine bought the company are much thicker and far stronger than this one.