The exterior is in fine condition. It is just white vinyl siding. I don't think it'll be too horrible to take down and put back up. Although, I've never done it before. OSB does sounds like a better/cheaper way to go too.
I have no idea about the footings. I would have to ask the original builder or just dig down myself.
The rigid foam would cover the exterior just underneath the tyvek wrap. So, it would be layered from outside to inside: Siding, tyvek, rigid foam, OSB, 2x4 + 2x2 mooney wall, OSB. The foam would be in addition to the mooney wall, not replace part of it. I was just thinking polyiso foam with the reflective covering would be best. That should help heat gain in the summer.
For the ceiling I was thinking plywood/osb, then a vapor barrier, and then cellulose up there too. The garage has soffit vents but no ridgeline or other vent in it, so that has to be added too.
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