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 {TAIL ~ said channel members} in transversely spaced relation 
of
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 { TAIL ~ said channel members } in 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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH