To actually start building the wing you will need to push some pins into the plan along the leading edge of the wing. The pins should be right on the black line as shown in the picture below, and be straight up and down. The pins will act as a stop in which the spar will be pushed up to in the next step.

After you have a row of pins along the front edge of the wing, lay the front spar (a piece of 1/16" x 1/8" balsa wood) up against the pins. Then push a pin into the foam board on the back side of the wood to hold in in place. make sure the wood is standing on edge as shown on the plan. Also make sure not to stick the pin into the wood itself of the wood will crack.

When you are done, the pins will be holding the spar in place as shown.

It may be necessary to 'cross pin' the wood down if it will not lay flat on the plan. The photo below shows the 'cross pin' method.

Use a razor blade and cut the leading edge spar to length, and then cut the wing tip spar at an angle as shown below.

Once the leading edge spars are cut to length, and the left and right wingtip spars are cut and positioned it should all look like this.

The next step is to position the wing ribs on the plan. This is done by using two pins to hold the rib in position as seen in the two photos below. Do this for all of the ribs except the very last rib on each end of the wing. Make sure to slide the rib all the way forward until it touches the leading edge spar.

This is what it should look like when the ribs are positioned properly.

Now the two tips ribs must be cut to size and positioned in place. Use the razor and cut the front of the tip rib to match the angle of the wingtip spar.

Then push the rib up to the spar as shown below.

Once both tip ribs are cut and in place, the trailing edge of the tip rib must then be cut to length.

After both tip ribs have been trimmed at the trailing edge, then position the trailing edge spar up against the back of the ribs in the same manner that the leading edge spar was positioned against the pins when you first started to build the wing.

Here is the new Division C wing all pinned into position, and ready for gluing.

After the trailing edge is pinned into position, check the tip rib cut length, if it is too long (as in the photo below) the spar will bow. If it is too long, then use the razor and cut it just a little off the end of the rib to keep the spar from distorting.