RE: Using covering material as hinges??
It can. And the width is sort of relative. If it's a small plane or Park Flier, they may need to be only 1/4" or less. For a 40 -60 size plane, I'd say 3/8" - 1/2" Keep in mind that you need at LEAST 2 strips side-by-side (3 would be better as in the illustration above) and there is no reason why you couldn't do it the entire length.