Thats about what we use in MI.
Ours are a little taller, and on skids (move them in and out and around easier with the tractor).
My uncle built them from scrap stuff, so we have old glass windows that slide. propane heaters.
No problem with mice per se', however, it's usually very cold in Nov, and no mice. BUT, when the heater gets cranking freakin bees/and wasps wake up from their dormacy its really wild.
Die Jagende Hutte[/url]
Mine doesn't have all that much in the way of amenities. I built it for when the kids were young, and they weren't quite ready for a treestand. We've taken a few deer out of it. It makes a nice refuge from the rain and wind. It wouldn't take much to put plexiglass windows in it and heat it. However, our freezers are full before it gets too cold.
Mice ate the first set of curtains. The current set stays in a 5 gallon bucket and gets put up as needed. I weighted them so they don't blow around as much.
Since it's been up, deer and turkey seem to ignore it completely. I've had deer brush past close enough to touch and turkeys within a few feet of it.