I've done many queen sized quilts and I've also done 6 or more king sized quilts on my Janome 4000. It can be a struggle, but working from the center out helped me. The very, very first quilt that I machine quilted, I did a king size basket quilt where the basket blocks were set on point with sashing in between. I was a very, very new quilter then, and since no one had told me I couldn't do it, I did it. On the first quilt, I did SID on the sashing, then SID on the basket blocks. I might never do another king size basket quilt again, I learned so much, plus it went on our bed, so no one saw it, and I had made it larger 110 x 110 so that I got some of the quilt at night - you know - one good turn deserves all the covers. It can be done, but be patient and take your time, you can do it.The class on Big quilts on small machines from Craftsy might be a good idea for me to sign up for, even an old quilter can learn new tricks.