If you decide to make the king-size quilt, maybe a double wedding quilt? think about doing what I plan to do:
Make the entire quilt top, then put 1/3 of the batting in the center section (with all of the lining) and quilt it. You would only have to roll 1/3 of the top and lining, so it wouldn't be thick. Then put 1/3 of the other batting on the right side, butted up against the other batting in the center. You could use the batting tape that is for joining batting, or not. Quilt the right side. Then turn your quilt around to the left side, which will be the right side now. Add the batting and quilt this side. Then, you are through quilting and don't have to pay for a long arm. I hope you can understand this. I made it up, so there is no "tute" on it yet!