I'm using the Fun and Done method now on my 16 1/2 inch blocks. I cut the batting 18 1/2 inches. I baste with spray. It's working great. I marked the inside of my back 1 inch all around to know where to center the batting (which is cut to the block size). I don't see a problem with the batting, joining the blocks, looks pretty simple. When I finish hand quilting these two blocks I'll join them and let you know what I think. I'm going to sew a decorative stitch on the overturn just to spruce it up a bit.