Anyone remember from the "old days", the simple quilting frames? Using "one by" boards, length to be determined by the quilt size. 4 boards in a square, at the intersections use wood clamps to hold in place. The backing can be tacked to the boards tightly. Then layer the backing and top. I have tied a quilt in this manner. I have my husband's grandma's frame like this. Works very well. ( I hope I have explained this that is understandable.)