Slip's comments are right on. You can also add bridging between joists to stiffen floor from sagging span. I would sheath walls and roof with 5/8 ply, then just housewrap until you decide on finish. You might want to check for local sawmill. Their first cuts are often discarded and that is the outer round, which can be used to make it look like a log cabin.
Oh yeah, bigger if you can. It is cheaper now.
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