Hi,
I've seen this setup before, too, and it looked to me like the machine is just put on some sort of 'dolly' with wheels while the quilt is put on a frame.
I actually prefer to baste my quilts (I use safety pins) and use my old-fashioned treadle which is a 'normal size' machine.
I drop the feed dogs (you can also cover them with a card), and I found one of those 'slide sheets' to help the quilt slide easier. I also use those plastic rings in my bobbin case to help prefer the backlash of the bobbin.
I work on one section at a time, and I think it works great. Beats having a HUGE frame set up, plus it's a lot of fun. You can do the same thing with any electric machine, I'm sure.
Trina