The guild you spoke of may even have a portable rack that they use for taking pictures of their large quilts on. I know ours does and it's what I use when I take the quilt to a venue to sell raffle tickets.
Another thought, years ago I worked in a large office with no walls, we each had these bumper things around us creating small rooms. Maybe you know someone who would be willing to lend you one? Ours were padded to act as sound proofing so that would be good for the quilt to lay on and display it quite well.