I would suggest using Solartex as the covering. The plane wont be affected by the slight weight penalty and it will look like you covered it in nylon but is much less hassle to apply. The model flies really well and I flew one regularly a few years go as a retro project. Mind you the club style police objected to my flying inverted circuits with it. This was with a standard 3 channle version and an OS15fp for power. Eventually sold it on to a guy who was learning to fly as it makes a great trainer.