Well kids, my wonderful plans got torn to shreds!
long story-short; we only got two nights out at a miserable site since my selected site was not accessible with a truck and I didn't have sleds with me to pull gear the 2 miles uphill to the site (don't get me started). The coldest it got was 12F and the site was very well sheltered from the wind, so that didn't even get factored in. It got nice and cold the day after we left, but isn't that always the way.
The SnugFit did wonderfully on the BlackBird. Genuine Draft's feet 'popped-out' from the SnugFit a couple of times, but after resetting the SnugFit and being sure the footbox was down inside the SF, all was fine. GD is a cold sleeper and did fine with the SF and a 1/4" GG pad with my RMS on top (GD, SF, GG, RMS...I sound like a government employee!
I did learn two things:
-Getting into a hammock when hanging above 3-4' of loosely packed snow powder is entertainment in its own right. Without my snowshoes on the bottom zipper came about up to my armpits and I was determined to get in without the shoes. How long you think that lasted?
-Snowmobiles are a horrible thing to wake to. One came zipping past our camp at about 6:00am; think I peed myself a little.