Are you SURE you need 11 yards? I'm not sure of what pattern you're talking about...
Sometimes what I do to cut a bunch of squares of the same fabric is to fold it in half so the selvedges match, then fold it again into fourths, making sure the selvedges match and ALSO the folds are parallel to each other. MUCHO IMPORTANT. If these two conditions are met, lay your fabric so the folds line up with the inch marks (this way you're getting a perpendicular cut), trim the selvedge off, and measure to 8" and then rotary cut! Then, after you get your desired number of strips, line the cut edge up on the horizontal line, measure 8" and use rotary cutter and ruler VERTICALLY and you will have perfect squares! As long as your blade is sharp and you line the top edge(s) on the horizontal line, you can cut several squares (layers) this way.