I kinda made these taper towards the end; get closer to the fuselage the further back you go. Made a simple jig kinda following what JimW did with his and had at it. Found that .o35 material wants to sqoosh (crimp) when bending it. Used 1/4" x .o49 tubing. JimW used 3/8" x .o49. Pictured, is the jig I made also; nothing earth shattering.