I did a king size, it was a lap throw that morphed, on my domestic Singer. I used lots of roll holders, we moved the machine away from the wall and then slow and steady went the process. Not on the floor? Don't see how that is possible, but you can try. It can be done, but I don't do king size anymore unless it is a QAYG. Don't let the quilt see the fear in your eyes and you'll have it made.