The rear skins first had to be trimmed so that the inner portions were angled out at the rear portion. Installation was pretty straight foreward. Pretty much the same as the rudder. Located where the holes were supposed to be on the skins, then drilled them first. De-burred, then primed the inside of the sklins. Drew lines on the center of the spars for alignment of the pre-driled skin holes. Once the skins were in place, I clamped the rear edges to the table so that the entire assembly stayed true and straight while drilling and clecoeing. I then worked from bottom to top, inside to outer edges, drilling and then clecoeing. I had to be careful because certain areas near the foreward edge could not be drilled at this time. Also, som of the rivets were the bigger A5 style. These were up near the hinge brakcets.