I have the regular HQ16 that I upgraded to include the ProStitcher and stuff. I love it.
I remember seeing the HQ Sweet 16 [sit down] years ago and someone had made a cradle for the quilt, so that it was somewhat suspended over the sitdown HQ and the the quilt didn't have any drag. It was a really neat set up and if I hadn't had my heart set on the HQ16 and gotten a good price on a used one, I would have considered it. I just e-mailed the person who is my source for this to see if it is still being made or if there is a pattern for it. If you PM me in a few days, I can let you know more.
ali