Your quilt is lovely. If you put sashing around every block, you would end up with double sashing, but if you "forgot" the top OR bottom sashing as you made your rows, it would work. You may have to remove some of the sashing to avoid doubles or if you don't have too many already pieced, you could make some of the blocks without sashing top and bottom and put them together. You can make this work with little or no ripping!