Forgot to add... the 2 man Otter Pro setup is called the cabin, the 3 man sled is the lodge. 2 man is plenty, and the padded swivel seats are a nice touch.
I run a Mr Heater Big Buddy heater backed right up against the wall of the tent and it is fine.
No light comes through the 1200 denier material, except pinholes at stitches.
Due to the high winds I face, I added anchor straps through eye bolts in the back of the sled. I use up to 8 anchors, 4 in the straps on the sled, 4 for the skirt to hold it down. That keeps me on the ice.
Hope that helps.