threading an elongated stringer through said at least two transversely spaced apertures so that a portion of said stringer extends between the opposing sidewalls of said channel member, said stringer being sufficiently long to receive {HEAD ~ a plurality} of said channel members in {TAIL ~ transversely spaced relation} 
threading an elongated stringer through said at least two transversely spaced apertures so that a portion of said stringer extends between the opposing sidewalls of said channel member , said stringer being sufficiently long to receive { HEAD ~ a plurality } of said channel members in { TAIL ~ transversely spaced relation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL