I have done a king size on my Janome 6600. Was a challenge but came out pretty darn nice. Quilting designs are pretty limited. Mostly stippling. I do start in the middle and worked out little by little the scrunching method. I have a huge desk that my husband designed so the bed of my machine is even with the desk top. Nice slick finish on the desk so everything moves quite easily. Takes lots of patience but the reward is worth it. The more I have done this the easier it gets. I wish to own a longarm some day so I can venture to bigger quilting designs, but at this point, I will do my best with what I have.