Elaine, That should be fairly easy to un-pick. I am currently making a T shirt quilt for a client. They decided rather than making it more than king size that I should make it double sided. I am facing the same problem with the blocks on the front not lining up with the blocks on the back. I am going to try quilting each side onto a flannel sheet and then enveloping the sides together after each is quilted turning it, stitching around the edge and tying or tacking it enough to make the two sides stay together. Since there are at least 50 shirts involved I don't know how else to do it and still include them all.