My construction is almost like Jacks. I used screen trim molding 1/4 inch thick and 3/4 inches wide. Cut the center pieces at a 45 degree angle and 2 1/2 inches long. (you can see that on the right side of the boat , picture , since the inside ,full length strip has not been attached yet)
Each one was epoxyed on with the longer part at the top and spaced 3 inches apart. Then the inside railing was attached. The railing was sanded so everything is flush and what wasn't was filleted with epoxy and wood flour to make it even.
The whole process adds about two more days to the building ... most of the time is waiting for the epoxy to cure or set up.
All of the wood is epoxy saturated. I use them as lash points if necessary and I also hang my water bottle from them. It has a Velcro strap on it and the strap fits thru the slot to hold the water bottle close by me.