Bill Poole: That IS the coolest looking set-up!
Good for you.
I have on several occasions back pack Rifle Hunted for Elk at elevations just over 8,000".
Staying warm at night is indeed a concern.
Getting out of bed in the morning is no breeze either.
The season's I have Hunted the opener varied between about October 21st to October 25th.
It IS cool at night in the high country then.
We used lightweight two man back pack tents- not much warmth retained by these at all.
I am going to save your link and show it to my Hunting partner and see if maybe we should cache a couple of those Whelen Lean To's next summer near our favored haunt.
Good luck this season.
Hold into the wind
VarmintGuy