I have quilted numerous quilts on my DSM. A few suggestions to add to what you already have gotten. If you decide to SITD, use a serpentine, herringbone or some other interesting stitch instead of a straight stitch. It adds interest to the quilt and isn't as noticeable if you miss the ditch. There is a book called 'Mile-a-Minute quilts' by Sharon Hultgren that is very similar to QAYG. Quilts are made in 20" wide sections and then covered with a sashing type binding. It would lend itself well to your pattern as it has the lattice type look to it. Then you would only have that 20" width by your length section to fit under your machine.
If you don't go that route, use your walking foot to sew a long curved line from corner to corner and then repeat it at whatever inch intervals you would like. You could even go the opposite direction and create a curvy crosshatch.
Your pattern would be fairly simple to use a grid-like pattern to quilt and with W&N the quilting distance is about 5-10".
I hope this helps and good luck with your quilts.