I just wanted to alert everyone who was interested in making this quilt that there was a typo in one of the measurements--I had typed 4-1/4" when it should have been 4-1/2". I've edited the post, but if you printed it out earlier, please make that correction. Thanks you Donna D. for noticing the error!
P.S.: If you've already cut your pieces 4-1/4", then make the other parts of the main block 4-1/4" rather than 4-1/2"--it will end up being a little smaller but the nice thing about this block is that you won't lose the star points. I think the only other thing that would change would be the length of your sashing--you'd need to cut that at 11-3/4" instead of 12-1/2". Sorry for the error--I don't know how many times I read over the directions and didn't notice it!