If it were me, I'd add a sleeve and hang the quilt from a rod mounted above the design wall. But if you don't want a sleeve on the quilt, use a full bar clamp in order to evenly distribute the weight of the quilt so it doesn't stretch.
I have seen quilts totally ruined because they were hung from separate clamps, clips, rings, etc along the top edge. They can easily wind up with 'scalloped' tops from the stress of uneven pull from hanging...the larger the quilt, the faster it happens. Think about how fast clothes get stretched out on hangers and multiply that by the weight of a bed sized quilt.
