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I wouldn't recommend any normal concrete to be poured at a depth smaller than 3-4 inches. The fact that you will have to anchor to it to build your walls would shatter 2 inch concrete. Plus, the weight of the building will be based upon the concrete, so depending upon the weight of the building plus the contents the concrete may have to be about 4 inches thick i would guess if the ground is compact enough. So 4"x6" wall is probably what you're looking at, make damn sure to throw in some rebar, at least a #3 running continuous. There may be some details I am overlooking, but I just got home from work and I am beat.
Ah yes, setup. I would use stakes and 2x4's unless you can dirtform it. No need for kickers but perhaps a small board or two nailed across the top edges to keep the form uniform.
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