Your quilt is so very pretty. I am piecing a GFG, which is actually a UFO from many years ago. Hope I can keep it going this time.
Have you used pellon before? and do you think it will make it harder to quilt?
I have found I have to watch those edges very carefully when I am first starting a new hex. They seems to scoot, so I have started pinning them in the center. Even then they tend to move.