WD
the tent materials have changed a lot. The little BD tent phat is showing off is a take-off the Bibler Awahnee, a nice design with a big window. The Toddtex was amazing stuff, my Eldorado is made of it. If I were going on your trip I would definitely take the Toddtex Eldorado at 69 ounces. It represents a safe haven in extremes at altitude.

Oh yes I wanted to say that for such a long trip that high you will need to consider the cookability of any tent that you use since you will surely end up coooking in it. What kind of stove will you use?

Jim grin
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.