The above sequence show how I'm going to mount the fin to the board. I added a chunk of wood to the inside of the hull to make a fin box. This is what I routed into to make a slot for the fin. The jig worked perfect so I got the fin straight and center. I'll either glass it in or find a way to lock it in so it can be removed. The front of the fin has a section that ges into a slot so it's locke din place. I'll need to lock the back in place. The real trick is to make it stiff enough that it doesn't rock from side to side.