I have the Quilt Professional II with the back extension. It was sent in multiple boxes and can be put together in place. Fortunately, I got mine right before a price increase when I contacted the company and spoke directly with the owner at the time. My machine is an Elna Carina from the mid-80s and the custom insert was just perfect. No table vibration with this setup (foot pads were extra) and was easy to adjust for my height when we put it together. Still looks as good as when it was purchased over 4 years ago.