I built one of these a few years ago, about 3-4 acres at my grandparents. I just dozed the fence row, a road through the middle and dug a pond. I then put a corn feeder in there to keep them fed and I turned hogs loose in there and I could go hunt them when I wanted to train pups etc. The funny thing is the hogs learned that a dozer stack is their best friend and they would burrow in them and you would have a dog baying a pile of brush
. Stomp around on the pile a while and they would shoot out and run a ways and then bay up again, it is good exposure for pups and fun when you get skunked a few times to go turn out in and hear something squeal.
Matt