I noticed there is no reenforcement for the concrete, or that your plans have indication of a footer. As you don't indicate and area of the country, frost heave could be an issue.
As a horse use, do not put concrete in the areas the horses will be, their shoes are very slick on concrete, do not use tin on the side the horses will be it will cut them up over time or damage their feet. The alternative is to put a footer board over the tin so they cannot get into it.
If you are in northern climes, try making the overhang 10 or 12 feet. Make sure the ground slope is away from the building and stalls even if you have to raise the whole site. without the drainage you will have the problem my neighbor does, their posts are rotting off and they used treated lumber and wrapped it with tar paper to protect the wood but the placement of the barn left water running down the west side and horse urine and manure make a strong solution to begin decay of the wood.
I would not use roofing nails on tin roofing, I would use roofing screws to attach tin, your roof will peal off in a strong wind. On the OSB, use ring shank nails, same problem as the tin.

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