I have done FMQ designs on a king size quilt. I like to complete my quilts from start to finish. It makes me feel like I actually did it. I did mine on a Singer 9940, another on my 301 and am now contemplating using one of my treadle machines next. The best trick I can give you is to make sure that you have the weight of the quilt evenly distributed by placing another table on my left side and in the back of the machine. Well actually it's my ironing boards.