Set it on tractor forks. Ratchet strap it on the forks horizontally around the house. This will keep it from falling off and crushing someone. Have post already pre set and posts level. Set the shooting house on top of four posts and lag bolt them on. Don't take strap completely off til lags are in and tight. Have set many like this. You need to brace posts off before turning house loose from forks. Cross brace the legs on the shooting house. Attach ladder separately. Steel of course Lag bolt ladder to house and burry about a foot of ladder in ground. This will also serve as a brace.
This will work if you want to have the legs pre-set. Make sure they are plumb and level and the whole thing is square. You could put a 2 by band around 3 sides and let it stick up a couple of inches. A pocket if you will, then set the house in it and add the fourth side after you move the tractor. Just don't build it too tight of course. Good cross bracing is a must on the legs. I've done and seen them done many ways, but a loader is yer friend, work safely.
