I'll be there, but this year, starting late Feb.
FWIW (no "rights" or "wrongs" here ...) my gear list is at http://www.nwlink.com/~brianle/AT_Gear_List_Gadget.pdf
Some hasty comments ...
I personally goretex socks over sealskinz --- sometimes sealskinz work fine, but sometimes I've been cold in them.
Consider balaclava or something to keep nose warm in cold temps.
no comment on layering bags --- hope that works well!
MLD bug bivy: can you sit upright in it? I didn't like mine for that reason, but YMMV
Mug and cook pot? Consider mug that can cook in, with enough cooking capacity (depends on cooking style)
food bag, other stuff sacks?
Do you use TP? (not listed)