In reply to Cooper:
Well, this sounds f*cking awsome, mate!
Obviously, you will need some protection.
I would suggest
http://www.armoroutlet.com/AOcrowd/AOcrowd.html
For your personal kit, as for the sledge, the long toboggan may be too combersum, I would suggest a toboggan structure, but lop it off so it's just your height.
Also, I would send down a sledge with sandbags in it first, with weight equal to yours (and the armour) To test the snow/ice. Make sure you bring a avi locator device!
-Magnus