I'm also working on my first double wedding ring quilt. This is def. the most complicated pattern I've ever done. I got the pattern from the book "Egg Money Quilts" by Eleanor Burns. It's been rather easy to follow. I still have 2 more squares to finish appliquing the rings on and then I'll start piecing. I noticed on your pattern that you didn't use squares on your corners Like this...
http://dogfeathers.com/quilt/images/WEDRING.JPG I have the corners. Maybe you could encorporate them? That would give you "forgiveness room". I'm banking on that myself. lol