With the perspective the way it is, the one arm/front piece looks a lot smaller than the other–but in fact, they are identical, don’t worry!
I think that sewing down the hem on the circular pieces would be hell if it hadn’t been blocked already.
I’ve followed the pattern perfectly, and I’m a little concerned about the back. I think that Kate’s suggestion to make it wider might have been good. Also, when I line up the side of the back with the side of the front, the side of the front is a lot longer. It can be stretched a bit to fake it out, and I can block it to match, but I wonder if it might not just be better to add a few rows between the darts. I won’t really know until I put it all together—the pattern even implies there will be some lack of matching up.