Thanks very much, Auntie! I've tried making one of those out of heat resistant template plastic. Works somewhat but I think it the narrow 1/4" that's the bummer! But a useful tool to bookmark!
Snip, yes you do sew the raw edges to the blocks for the top ... Best if you see the tute by Kimberly here on the board:
http://www.quiltingboard.com/tutoria...s-t115627.html
You need to hand stitch the folded edge over on the back (I reversed Kimberley"s so the hand stitching is on the back of the quilt).