I have poured 12 of those corn crib foundations. The way you out lined would be fine. It does not need to be more than 4 inches thick in the center. I drove a 1/2 pipe in the middle to measure off of. I then dug a footer 18 inches deep and maybe a foot wide around the edges. I made the middle crown up a few inches. I used 1/2 plywood for the forms. You can bend it to match the radius you need for the outside. Leave the pipe in the middle and drive a couple of big nails in the edge of a 2x8 an use it as your screed board. Leave the pipe a few inches higher than the sides and you will get your dome easily.
The edges carry the weight of the sides of the crib. I did use 4500# concrete and wire mesh for reenforcement. None of the ones I have ever cracked. I did not put any fill under them. I like hard virgin ground. Fresh gravel will not pack tight enough and it will cause the concrete to crack. Measure the crib and put your anchor bolts in while the concrete is wet.
Like I stated I have 12 of these and they all where poured just like I out lined. I did the first four by myself. You DO NOT need to hire anyone to finish the concrete. Just float it off and hand finish it a little. The ears of corn and mice/rats will not care.
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