It's done! S is going to be so happy when she comes home from school! I can't wait to take a picture of her wearing it. I could not have finished this cardigan without the help of this article from Knitty about seaming and this tutorial on sewing buttons from Craftstylish. I lightly blocked the cardigan before seaming but I'm thinking I should probably do a full block after S gets to try it on. Here it is, button and all!