here is a link to a blogger who was working on it. she laid out the pieces trying to guess the layout. she guessed wrong, but you can see all the pieces.
http://fabadashery.blogspot.com/2013...-solstice.html
the same blogger shows here how to put together what i consider the trickiest block
http://fabadashery.blogspot.com/2013...-solstice.html
hope this helps you some
by the way, i found this by googling images of bonnie hunter celtic solstice mystery quilt