I attached two more pictures. As you can see, they are covered in wood, i assume it's balsa, it's 1/8th inch thick. is that a normal skin thickness for this size plane? The third picture is of the un painted, unfinished (and undusted) area under what i assume used to be extra flaps. also, the surface of the wing, after i sanded some paint off, is still shiny, not raw wood. is it possible the builder layed epoxy over, then painted? that would make it stronger but much heavier...

also, in response to a build wing should be lighter, this kit is from around 1971, so it might not be lighter.... don't know for sure, but does anyone have a wing roughly this size/shape that they could tell me the weight of for comparison?