Wonky in what way? I like to add the sashing to the sides of the blocks and then a full piece across the quilt width wise if the quilts is less than 45 inches wide. If the quilt is wider than 45 inches, I cut sashing down the length of the fabric and do full pieces lengthwise. I like to use cornerstones whenever possible because you don't have to worry about full length pieces of sashing. Use lots of pins to keep the blocks and sashing from traveling. Be especially careful not to stretch the seams as well.