Nice deer stand. What kind of wood?
Also, can't tell from the pics, but to prevent rot, the legs shouldn't be resting directly on the ground. A concrete block or even a broad stone will help immensely. Should be at least 3 or 4 inches above the dirt. Also, that'll help disperse the weight so it doesn't sink in much. And painting on some coal tar or other sealant onto the bottom foot or two of the leg wood will also be good, especially since the legs flair out beyond the roof line (particularly the back side where the rain run-off from the roof will fall. Though a gutter would be better maybe since this is where your door/ladder is).
Would be cool to see an interior pic too if you got any.