Yup, that is exactly the plan, virtually word for word. Prior to gluing, I'll sand bevels 30° off of facing surfaces of the fins using another jig. For gluing the pairs and then sanding in the convex curve I'll use the same jig that later holds the fin pairs to the tube for gluing them to the tube. That is, the jig has room for all three pairs, and I can use it for one pair at a time while assembling the fin pair subassemblies. The root edge rounding will be done with sand paper wrapped around a coupler.