I have to taper out the stiffeners front and rear. The front ones will follow the curve of the bridgedeck so I will make those once the bridgedeck is up and I can shape them to the curve. But the rear ones I will make and glass in and fair out before the deck is raised. I have an offcut of rectangle pvc that I used as a female mold and James poured in some expanding foam mix. After it has set I can cut it with a hand saw and and sand it and shape it. I will glue them down and glass them in, then fair it all out so the stiffeners end in a taper.