>> Possumdown gloves+vapor mitts
> Can the Possum gloves be used inside the mitts? Won't they wet out? Anybody tried this?
Yes, it works well for very cold temps. You can sense when they are getting too wet, which means it's too warm for the liners, so you take them off and stuff them in your coat/pack.
>> Cocoon pants/VB pants/Gamma MX
> Which of these leg layers would he use for digging the snow cave?
If this was my pant setup, I'd be digging in the VB's over the Gammas. Your legs don't sweat as much as torso in digging a cave, the Gammas wouldn't wet out too bad. I wore VB (silnylon) pants digging a cave a few years ago, and layered them over softshell pants, it was ok. Damp, but ok.
>> I suggest that more fuel is needed.
For me: generally, 6-8 oz of canister fuel per day is required to melt snow for water. About 4-5 oz/day of white gas.
>> VB clothing...
> Maybe Ryan would comment on his personal experience w/ VB clothing and his comfort level with using a VB jacket as a primary torso layer for this trip.
No problem, unless it's warm. If daytime temps are > 15 deg, it'll be sweaty. But I expect them to be < 15 so it should be fine.