If you have plenty of poles, don't split them. Put them in the holes and line them up as close as possible, get them as vertical as you can, then hang your rafter trusses. Go ahead and roof it at this point, if you want. Once the poles are set and anchored at each end, string a chalk line down the outside even with the outside of the two poles that are farthest "out" in the line. This chalk line would probably be at the bottom of the poles since they'll be thicker at the bottom. Scab a 2x6 onto one side of each pole so the EDGE is facing out, and that outside edge is vertical. If each 2x6 is straight up and down, and each one is touching the chalkline, you'll have a flatter surface to build on than you'll get by splitting the poles. A few furring strips across the edges of the 2x6s, and you can apply steel siding. If you want a flat surface on the inside also, you can put vertical 2x6 boards on the other side of the poles to establish the inner wall face.
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