For about 3 years I have been sandwiching my quilts on my design wall. Nothing fancy. Just 2 sheets of rigid insulation I bought at Home Depot. I don't put felt or flannel or the insulation. Pin your backing on the insulation, smoothing well, pin at top and along the sides and along the bottom. Spray with spray baste, put your batting on and using straight pins attach to the backing. Spray baste the batting and then attach the quilt top. I usually put a few safety pins around the edges just to keep it stable while I am wrestling it around for the quilting.