I just saw that you plan on using 3/4 in plywood. That should be good to support just a few inches.
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It's not a terribly heavy structure so I'm hoping that I can get away with not having to re-build the base.
Thoughts?View attachment 3308586
While I'm at the hardware store, I'd be picking up lag screws or through bolts to replace those screws on the posts, if my design is relying on my fastener's shear strength. I'd probably add triangulation to the legs too so they can't deflect - my inlaws have a small coop about the same footprint as this, and it had non-triangulated legs about the same length as those. Gophers got to the area under the coop and sunk a corner enough to shift the weight and the leg snapped off where it was connected with 4 screws, all 4 screws sheared off.
Bury the legs below frost level.I live in Minnesota, so frost heave is definitely a concern. What would you recommend to make sure the building won't have structural issues due to the ground?