I suppose that could work but the efficiency would be terrible. You would be a lot better off by taking a regular (old used) sail and cutting it down. Cut a bunch off the foot and put in a new clew and tack plate. For the head, attach a permenant wire cable with a ring that would compensate for the shorter sail and end up at the height the normal sail would be for hooking on the mast hook or to the original halyard system.