Her dough recipe is available in the sample on Amazon, it's an all-butter crust with some egg and vinegar, she also suggests using either carbonated water or water with a pinch of cream of tartar in it.
I think she uses an egg white 'glue' to get the pieces to lay flat while baking.
There are a few other books on pie art, but this one looks like it has great pictures, too bad they don't give a sample of any of the pages covering the designs so you can tell how doable they are.