Going back, it looks like Clue 6 was 12/31, New Year's Eve. Discussion starts around page 74. I didn't print out or keep the PDFs because I was following in real time. You can still buy the project but that seems sort of silly for one step.
My notes show my flying geese units with the Parakeet color along with what I'm calling "blue QST" which looks to have been made in step 4. My notes say it is 41 sets -- I believe that this is where we start separating out our block subunits from our border subunits.