I am making a wheelchair lap robe. I made the blocks using the Benartex crazy quilt foundation fabric. The blocks are completed and sewn together. I read here on the board that these lap quilts can be backed with flannel to prevent slipping off of someone's lap. My question is this - because the blocks are really two layers of fabric ( my piecing and the foundation fabric), and using flannel as backing - should I also use batting? Would this make the quilt too stiff and too thick to tuck around someone's legs if they are in a wheelchair?