I agree with Crafty_linda_b, leave off a row and use narrower borders. Or you could eliminate the borders entirely and just make the center. Are you doing your own pattern, or is there one out there? You could also make the rectangles smaller, but keep the sashing the same size. That would bring it down a few inches. If you took one inch off each dimension of the rectangles and wide strip rows, you'd drop 5" in width and 9" in length.