I have friends that on their property have actually built tree houses. Very large houses at that. That is the benefit of owning your own saw mill and having lots of trees on your property.

One of them has a sofa in it. It also has a funnel with a long hose that runs out the side and down to the ground, into the ground where it attaches to a buried5 gallon bucket full of holes.. You can guess what that is for. He too has a shooting table and he takes his bench rest out with him. It has propane heaters and a small gas stove as he like to cook grilled cheese sandwiches or bacon and eggs (now how can that be scent contol)all day long and drink hot coffee.. He shoots a lot of deer out of it, and its a nice place to warm up, have a cup, even a sandwich if hungry when you are out walking his property...

I always get a kick out of stands like that with heaters and urinals and such... but in the late muzzleloader season when it can be 20 even 30 below on rare occasion, the heater is a nice thing...