Your bargello is stunning. What you have explained for the backing sounds good, if you use the larger strips. My question is: How are you going to quilt it? Are you sending it out to an experienced Long-Armer, quilting it yourself on a domestic machine or hand quilting it? The reason I ask, is because I am afraid you will have alot of bulk with a bargello on both sides, along with alot of stretch potential. I am not trying to rain on your parade, because your quilt is truly gorgeous, but these questions came to mind as I was admiring your work.