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I've split logs for making smaller skinnies, but to do it easy you'll need a straight log free of too many knots. I have a milling attachment for my chainsaw but it's a bit of a pain.
I'll usually use wedges and a maul to split straight logs, I'll try to grab some pics later of a bridge I made by splitting a 7 foot log.
also a 4 to 6 inch wide skinny is ok at ground level, but definitely want to to add some width the higher you go. I think Whistler says something about 2" wider for every foot higher? This fella shouldn't be more then 3 feet off the ground at any point, but to keep it safe and friendly I think 16" should be fine. And the best price per foot of 2x4 seems to be 96" so that should give me 6 planks per board.
This will be great. When you first mentioned making it a skinny I was thinking you were going to cut the trunk in half - I was curious how you would do it!