It seems I spoke too soon about larger versions of Mary Konior's Spinning Wheel pattern not working out. Mad Tatter, Alberta has made a version with 6 rings on Row 1 and 12 rings on Row 2 that looks very nice. See her picture here. There are more "bare" chains on the outer edge than the original pattern, but it still works. Perhaps some intrepid tatter could work progressively larger versions to see how big they can be and still look good. Not me though, I'm too busy tatting dragons.