Just wondering here. Plastic film doesn’t add much in the way of strength, fiberglass or poly adds strength and some weight and silk (or equivalent) is about the same as plastic film.
Isn't the idea to seal the wood?
Why couldn’t I just seal the structure with poly or a thin epoxy finishing resin to seal the wood, sand and fill to desired finish and then paint? Would cut down on the weight, add about the same strength as the silk or plastic film and still allow for the paint?