I googled this a while back for a large quilt- found all of these methods plus more. Came across one method where the quilter's top and back were divided, but in different sizes so that when she put them back together, the joining seam were not in the same place(top in half, backing in thirds) does this make sense? I have tried the reversible method and the method where you piece the batting back together after you quilt half of it-ended up with a wrinkle in that one. I have a book and there is a method where you piece the top or back together after quilting and then apply sashing over the seam i believe it's Conquer and Divide. That is the method i am using for my lighthouse quilt. The sashing/ binding strip will be part of the design element in the quilt.