Balsa plank style line-control airplanes often were sold with similar wing blanks. The plans usually had you profile a normal wing shape with a wood rasp, files or sanding blocks. Better kits included balsa profiled leading edge sticks that we could glue on. Foam is easy to round over the edges with the same kind of tools. There's no way to add color without adding weight. Colored tissue paper is one of the lightest methods and also makes foam stronger. Water down some white glue to a water like solution and apply a very thin coating to the model with a spray bottle set to mist. The precut colored tissue paper can be layed on top of this misted surface but wait until it dries to a tacky state otherwise the color could run in the tissue paper. The jap tissue paper supplied with kits didn't run but cheap crepe paper for example would streak and run like crazy when it gets wet. We actually glued down the tissue paper on balsa wings and bodies and after the glue was dry we misted the tissue paper with water until it was soaked. It would shrink up even tighter than silk once it dried. There's probably a video these days of someone covering an airplane model with tissue.

No flying video?

Could you post the e-bay link?