If the plastic makes like a wave across it when the wind blows (not sure if I am explaining that clear enough) then one thing they do here on hoop houses and tobacco tunnels they add a cross rope. you would tie a rope from bottom corner to opposite bottom corner so that the two ropes cross in the middle of the top of the greenhouse like an X, you can adjust these ropes so that it tightens the plastic to the frame of the tunnel. This sturdies it up a bit. Just an ideal if the winds become an issue. The greenhouse looks awesome by the way.
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