Tape a sheet of sandpaper to a flat surface, and slide the nose section around on it until the edge is straight. Now cover the edge with some clear packing tape. Rough up the flange on the tail section with 80 grit (or a pass through the bead blast cabinet), then cleco the nose cone into place. Now fill the seam with a mix of epoxy, micro, a little flox, and a little cabosil. When it cures you'll have a matched edge.