I love the scrappy quilt that is on the cover of the October (yes, already out!) issue of American Patchwork and Quilting. The directions say this 71" square quilt that is made up of 36-8 1/2" blocks, with each block using a variety of fabric. It then has 2" sashing of a brown color between each block and a 1 and 3/4" outer border of the brown. It says you need 5 and 1/3 yards of the brown fabric for the sashings, border, and binding, yet only calls for 4 1/2 yards of backing. Can the amount of the brown be right since the 8" blocks are made of something else? Seems strange to me that it would be even more than the backing. Any thoughts on this?