Wing Template Use
You received a plywood wing template that is cut in the outline of the upper surface of the wing. This is your guide for establishing the correct profile for everything that will be attached to the rear of the wing. This includes flaps, ailerons and, in this case, the root and tip ribs. If you utilize the template for alignment, you’ll find everything is nicely lined up and the airfoil is accurate.
Root Ribs
Attaching the root ribs is quite straight forward, although there are several possible peculiarities
depending on when your kit was produced. The shortening of the bottom stiffener has been mentioned, but we’ll discuss it again in relation to the root rib. Briefly, in a few airplanes, the bottom flap bay stiffener is 3/4” too long and must be shortened to allow attaching the root ribs. Use the wing template to align the root rib and clamp it against the vertical stiffener in each of the root rib positions. Drill four #40 holes through the rib and the angle that’s riveted to the rear spar. Before drilling, make absolutely the rib is flush against the wing template.
Cleco both ribs to the spar attach angle and slide the pre-bent aluminum skin over the ribs and under the skin and above the flange. Notice on Drawing 2 that the rivets between the two root ribs going through the skins and the spar are AN426-4’s, NOT AN3’s.
On some older kits, if the supplied metal is flushed to the fuselage-side of the root ribs, it hangs into the flap bay by about 1/4” and partially covers one of the holes in the lower rear wing skin. If this happens, slide the sheet metal toward the middle of the airplane enough that it is flush with the flanges of the root rib in the flap bay and clamp it in place in preparation for drilling the rivet holes. Use a rivet spacing fan to layout an even row of rivet holes. After they have been drilled, remove the ribs and the trailing edge skins and debur and dimple all holes.
Trailing Edge Tip Rib
Because it is rather fragile, you can hold off installing the outboard, trailing edge rib until much later, when you’ve riveted down the top skin of the wings and are ready to install the wing tips. The wing tips will protect the trailing edge rib. An alternative is to install it temporarily by clecoing the wing skin down and drilling all of the tip attach holes in the ribs, skin and tip, so the wing tip protects the rib. Then remove it until ready to close up the wing. Regardless of which direction you go, install the tip rib the same way you did the root ribs: use the wing template to guarantee proper alignment and fit the fiberglass wing tip to the tip ribs, not the other way around.
The supplied plywood template is the key to establishing the vertical placement of both the ailerons and the flaps.

Left wing root. Notice how the bottom skin stiffener abuts the flange. You’ll use the plywood template for aligning the ribs.