I cast on for the actual sock today, and it is totally fun so far. I got through the "Act I" part of the pattern, which means I am 1/4 done!
It unfortunately is liking to curl up on itself at this point, so it doesn't look like much unless I am holding it open. But it is the coolest thing! If I am not sick of this after knitting the pair and doing all that kitchenering, I may do a pair of these for C as well. This is going to be so much fun in this colorway.