I've done 2 king size and several queen size on a dsm with 6.5" harp. The hardest part is managing the bulk between me and the needle. It's best to start in the middle and work out. SID works the best for me, and I often use one of the decorative stitches rather than a straight stitch. When doing SID I like to roll both ends toward the middle and hold with rings, then start stitching in the center, unroll as I go. A tight roll will help get the bulk through the harp.