Here's the cording layout I finally came up with! Samantha and I went to visit our friend Beth this weekend, and met up with some super-awesome ladies for a sewing day. I got my layout traced onto the actual stays pieces, with some help from a new friend:
This is Jewel, Beth's new baby green-cheek conure. She kept us company almost the whole day, and she really enjoyed nibbling the end of my pen while I traced lines onto my stays.