I have a 6 1/2" throat on my DSM and have done up to an 80" x 80" using a cross hatch pattern (diagonal lines from corner to corner in both directions. I used the widest blue painters tape (approx 1 3/4") and also pinned it down the middle, then stitched down both sides. If you use temporary spray adhesive or Elmer's school glue to adhere the front, batt, and backing it will not wrinkle on the back. I just finished two twin size, 66 x 101, doing stitch in the ditch, AND FMQing in the blocks. It was very doable. I did the stitching in the ditch first to stabilize the entire quilt, then FMQed the blocks around the middle section so the majority of the quilt was laying to the left. Then I attempted the center (thinking I may have to do another design) but it wasn't bad at all. Just binding them now. Good luck. The cross hatching and SITD definitely have to be done with a walking foot !