Thanks. The bottoms of the inlay cavities were routed flat by placing a board on each side of the neck and riding the router attachment on them. Then the inlays were glued flat and then filed, sanded, and buffed to the shape of the scallops. The inlays are thick enough and the scallops not so deep, making it possible to do it this way. However, even though the reflective surface remains flat, even that looks curved because of optical distortion caused by the curvature of the other surface. In fact the flat reflective surface appears convex, or opposite of the concave scalloped surface.