I've never gone larger than a queen-size. For yours -particularly coz it's upholstery fabric, I would suggest putting the whole top together and the entire backing but cutting the batting in thirds. Then you only sandwich the center part and roll the rest of the top and backing so you ONLY quilt the center piece. It is MUCH LESS bulk when you don't have to handle the rest of the batting. The side sections get added one at a time and then you can quilt that side section. Again, you will have to deal with only 1/3 of the quilt under the throat of your machine.