I'm still learning, too, but it's seemed logical to me to use the same principle as putting on your border....add sides first, then top/bottom or vice versa. So, I stitch sashing strips to the inside side of the blocks, then stitch the sash/blocks together in rows. Then make sashing rows with cornerstones and stitch them to the inside top or bottom of the rows. Then stitch all the rows together and add your sashing/cornerstones to the sides. Hope this helps, but maybe there's another way that we'll both learn about from our Board of experts. Have a wonderful quilty day! Karen