Today I did a little work on one of my Stay-at-Home Robins - the other one is on tomorrow's list. First, I tilted the bottom left rectangle, which makes me much happier (they needed to either be both straight or both tilted, not one of each).
Then, I added the December blocks (round 6) to the left hand side:
I also was very sneaky and added the January blocks, but you can't see them until January. I know, I'm a tease!