imho, i agree with sandpat. that's a great method. it keeps the back nice and clean.
when you do the echo quilting i think it would look nicer in plain stitching than zigzag. the zigzag would detract from the pretty fabrics and beautiful shapes on the blocks. i would keep everything else simple. the only exception might be colored thread.
keep on posting this. it's coming along just wonderfully! i can't wait to see it finished (and on my bed).