I have done a large King on a small harp machine (brother cs6000 and I would guess around 5-6"). I did fmq and straightline quilting. It isn't the easiest process, but it can be done. I puddled the quilt and had support for the quilt behind the machine and to the left of the machine. This eliminates having to fight the weight of the quilt too. You don't need an expensive machine with a huge harp space in order to make a beautiful quilt.