As said earlier, all control surfaces are from wood 5/8 inch thick. Notice that the wing is raked both on the leading and the trailing edges. Begin with a piece of wood 5/8 x 3 1/4 x 14. Taper the trailing edge of the wing so the taper rises 1/2 inch on each side to the point where each half of the wing intersects with the fuselage. From the point where each half of the leading edge of the wing intersects with the fuselage taper the wing back from its 2 3/4 inch width where it fits into the rabbet made for it in the bottom of the fuselage to a width of 2 inches at each wingtip. Round the corners.
While the wing is still unattached to the airplane, use a spokeshave to give it the classic teardrop shape of an airplane wing. Leave the wing with square corners where it fits into the rabbet on the bottom of the airplane, but shape it as much as possible from the side of the fuselage to the tip of the wing.
Glue the wing in place. Sand to make a smooth airplane look. Finish with clear varnish. The kids in your life will enjoy loading and flying their people with their own airplane.