I’ve had good success with the cabelas aklanak in fairly cool weather. They are not a -30 tent by any stretch, but the 12x12 will fit 4 cots, a kitchen and a wood stove. With a decent wood stove with 4-6” of sand in the bottom, and old boys that need to piss in the night-and throw another log in the fire, they work well. I love canvas, but the weight and rot from damp storage are dealbreakers for me. 1/2 hour setup, maybe an hour for the whole kit. They could use a tarp over top, the roof vents are made for summer, but can be sealed with some Velcro tape. Long as you are using wood they are dry as a bone. Buy the vestibule.
I’ve spent many a night in canvas at -30, no matter what you do a hotel is more pleasant. If you are dealing with -15 or above for lows I’d go with the aklanak.