Since you really don't want the embroidery stitches to show on the back and trying to hide your stitches in the batting will be very difficult, why not put that information on a label and attach it to the back of the quilt? Do make sure you put the name of piecer of the quilt as well as your name as hand quilter on that label!!! Personally, I think you are crazy to hand quilt something that big, but I am still hand quilting a wall-hanging that I started over 3 years ago!!!