The second front feels better to do, probably for the usual reason that I know now how it turns out. I made it past the armhole shaping, and am almost done the most complex of the remaining spirals:
You can see in the photos that the shoulders got actually cast off. Usually I leave them raw and do a three-needle cast-off, but that's physically impossible with the double knitting colourwork holding the pieces together. So instead I'm doing a variation — casting off the fronts, and then grafting the back to them. I prefer to have only one cast-off line on shoulders — otherwise, they get too thick and misshapen.
I am so looking forward to working on the sleeves and collar.