Trimmed cover and transfered holes and trim to right had part and left rear lower wing skin. Drilled and clecoed in position on skin.
Image 2) Drilled holes to #12 in steps on drill press. Held nutplates with screws and washers to protect the part surface. Marked rivet locations with 3/32" drill bit. Removed nutplates and screws and drill all the rivet holes and deburred them.