From the pictures, its hard to tell if the front half of the wing was sheeted (from the spar to the leading edge). Many trainer wings are because it adds a lot of strength to the leading part of the wing. If the strip on the top is raised above the rib edge, thats usually a clue that it should be sheeted. Sheeting takes a little more time, but isn't difficult. Rather than trying to type out a full description, you can probably find lots of help by doing a search on wing sheeting.

Brad