Very lightweight gliding aircraft can be covered with much thinner materials that are a fraction of one-thousandth of an inch thick. I recommend that you visit your local hobby shop to get information and materials required to build small aircraft. Picking the ideal material for each piece of an aircraft's structure is important because the power required to fly goes up proportionally to weight to the three-halves power. The key items that influence the design of an airplane are its mission, the payload weight it needs to carry, and the type of propulsion system selected. Typically these influencing factors are expressed as a list of requirements in the preliminary design stage of the design of a new aircraft.
Preliminary design is probably the most important phase of the design process.
My husband is a sculptor and has been building ash-wood armatures that are oftentimes suspended. One of his sculptures is an imaginary plane and is hanging at the Portland, Maine Jetport. The material on your gossamer condor looks exactly like what he might want. Thank you very much. Also, we have used many different covering materials over the years.