I've done several QAYG quilts, from king size to lap. The king size one I joined the blocks(front and batting) and did a solid backing and joined it by stitch in the ditch for the rows. The throw and lap size quilts I did the entire sandwhich (front, batting, and backing) and joined with sashing between the blocks. I have to say, I like the sashing method the best. IMOP, when I joined the blocks and did a solid backing, I could feel each block on the back because of the bulk, and I ironed my seams open for it. When I joined the blocks with sashing, I did a half inch finish, so when joined with a 1/4 inch seam they laid flat and no bulk. I really enjoy the QAYG method.