Pretty sure I will be wrong here, but, maybe this is one of those times you would sew your outside edges together and turn inside out. I think they call it "birthing". If you do it like that, I wouldn't try to machine quilt, I would tie the quilt at the suggested spacing. Tying won't take up as much fabric. At least I hope this works, as I am going to try it myself, for the same reason. !!LOL Ladies?????