I think those are just beautiful, and you were worried.
Kat- I believe you are thinking of the center as a square-in-a-square. That may make it a bit more complicated but it can be done of course. If you see it as 4 squares making a square it is a bit easier, especially since you won't have to figure out 4 outside triangles. I'll find my Fons and Porter easy hourglass squares tutorial page and post a pic tomorrow hopefully....
For anyone Question? If I were to take (this is for the center triangles) two squares and right sides together sew along the outer edge all the way around then cut on the diagonal in both directions that would create 4 of the 1/2 triangles, for the correct size I would have to start with two 4.5 inch squares? I have not looked at the directions, I try to figure out how to make the block mentally by looking at the finished block. Or am I making this too complicated and I should read the directions? and that would not be a short cut?