Go to a hardware store and look for corner protectors that are used by wallpaper hangers and carpenters to protect outside corners from being hit or dinged. It usually comes in 8' lengths. Cut to fit the corrrect length in the hull, then glue 2 pieces clamped together on one side with the cowl in between for proper spacing on the other side. You can get about 10+ sets made on 1 length.