For that size you should be fine if the ends are open. For reference, I worked at a nursery that had a lot of 15 x 80 ft quonsets- on a sunny 50 degree day they had good growing conditions for tomatoes with only the doors on the ends open.
Before covering we wrapped any sharp edges with duct tape to avoid holes being poked in the plastic. If you can find greenhouse plastic it would be a plus. If you opt for the vapor barrier, better have a spare just in case.
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