Beautiful wall hanging, you did a fantastic job. How about mounting it on 1/4 inch plastic core board, like the stuff they make for organizing your fabric. The boards that you wrap your fabric around and can then stand them up on a shelf. This would give the quilt stability without adding weight. Attach a 3M hook on the back and then hang. This would display your work, wouldn't weigh a lot and shouldn't make a big hole in the wall.