Our camp is 12x28 and heated with a wood stove. There is nothing better than a wood stove for heat and drying clothes after a rainy or snowy day in the bush. And as you already said wood is usually free except for the work involved cuttin and splitten.
You might want to start a camp/game log like we did and keep track of sightings, weather, time of day, kills and misses. Its funny to read at night when havin a few beers. I would like to think someday I will have grandkids who will inherit the camp and they would like to know the camps history.