I recently made a large queen/king size black/white quilt for last year's family reunion on July 4 in KS. My quilt went, unfortunately I could not. I squared up each block to a specific size, can't remember if it was 10.5 or 12.5. I was careful, I thought, to get an exact 1/4" seam, but sometimes I didn't and that's why I squared up each block, which made the quilt go together easily and with less frustration. Sometimes I only trimmed a sliver, but even 1/8" can make a difference when you are making a large quilt. I was lucky that my oldest niece and nephew acquired a long arm and Judy volunteered to quilt the quilt if I got it to her by April 1. Since I was going to have rotator cuff repair and surgery, I quickly agreed, since my surgery was scheduled for mid May. She hopes to be able to have an established quilting business when they retire in a few years, as her husband likes to quilt also. Forgot to mention that I have a 12 1/2" square up ruler and it is one of my most frequently used rulers, but I'd also like to get the next one larger for when I make large blocks. Can't wait to see your finished quilt.