I've done queen size on my small Brother machine....just simple straight line quilting and SITD. I also have done quilting just ouitside the ditch. Maybe you could use some of the fancy stitches that are on your machine.I like to do a fancy stitch...think it's called herringbone stitch...and quilt right on the seam. My friend uses a double needle and quilts either side of the seam.
As WandaVA said...it isn't easy but it is doable.