Originally Posted by tbctx
The point of the comment on head in the footbox is that while yours still head to left, feet to right (for a normal lay) it changes the "side" of the zipper. So now instead of a left zipper you have a right zipper. Doing it with a reversed WBBB you have a right head, left feet and left zipper, meaning you sit in and lay back the way they wanted to do.
that was my understanding of the OP's original concerns. this has sparked a thought about adding a small pull tab at the footbox, so i can guy it out with a stake. im interested to see what improvements that may offer, if any.