I trimmed both aft wing root fairings slightly so they would fit onto the airplane, then joggled both of them. Next, I drilled the #30 forward attach holes, and clecoed on the forward wing root fairings. Then I began the process of pre-bending the forward fairings to the leading edge of the wings. After marking the apex of the wing's curve onto the fairing strips, I set up a length of 1-1/2" OD PVC pipe, and clamped so it hung off the end of the workbench. This made it pretty easy to work the fairings to match the wing's curve.
I joggled the aft wing root fairings by using these strips, inserting the whole thing into a vise.