Squared the wing ensured no twist i then attached the upper aft skin on the wing sub structure, we got all the ribs lined up with the skin and drilled and clecoed, then proceeded to drill the front edge of the wing skin that goes through the spar cap. Once that was done, we went ahead and drilled the brackets that strengthen the aileron bell crank bracket. After that we up drilled all the rib holes to final size but did not up drill the leading and trailing edge as we will need to overlap the leading-edge skin and control hinges later, so we wanted to keep those holes small for accuracy.