Some of you seasoned quilters would have to say if this works or not, but I am wondering if one would use ultra thin interfacing (fusible, woven type) behind each of the old blocks before piecing together with your repro new fabrics would help the stability of the old blocks. What a wonderful challenge you have been presented, ibquiltin. Do post your initial reactions when you see the blocks and, of course, keep us abreast of your quilting progress.