I remember seeing your design for this quilt and it was beautiful. This may not be a helpful suggestion, but I am thinking since this is a charity quilt and short of time, I wonder if you might regroup and change the pattern to something more adjustable like a rail fence or nine patches for the strips. If they sew up a little narrow you can adjust the size of your crosscut square accordingly and just "gett'er done!". I hate precuts too! When I saw your design I thought you must have had a nice stash of patriotic prints---something I hardly ever have but often wish I did!!