Take that end piece, the parallelogram, and push it only to the wrong side of the hole. Pin in place
This is what the wrapped SAs look like from the wrong side. You have two options now. One is to topstitch the facing in place and the other choice is to ditch stitch from the right side in the well of the seam between the wrapped SAs and the bag. This leaves you with a clean slot to just place your zipper behind and topstitch into place. I think it is pretty cool and hope you do too! I love it when I learn something new in sewing. Thanks, Koos! I think this one belongs in the tute column, don't you?.....Bunny
ETA, 02/12/13: I did another Koos bag and the post contains additional hints for installing this zip. You might want to check it out. Here's a link: Koos Zipper 2.0
Fall sets in on the Deer River.......