Ouch, when you said it was wrecked I wasn't expecting it to be so bad.
So the shredding occurred as you tried to dismantle it on the last day, or did bad winds cause it to tear like that? Were you running a stove in there for the week?
Good tips, especially about the sacrificial cord, I'll remember that one, I use deadmen anchors but tie knots so the cord can pull free, although I've never had a foot of solid ice to contend with
All things to think about when I finally get round to using the Seek Outside sil setup
Great score on the Snowtrekker mate if it comes good