Kyiav10, On both of my OBW I used a 24"return. If you go smaller it's a bunch of sewing but it still works. You need a design wall to audition them on . I numbered each row as I sewed them together and hung them on the flannel. It tells you in the book how to pin then so you can move them around to audition them before sewing them together. Hope I didn't confuse the issue.