I think what you are looking for is either a band saw mill or chainsaw mill.
DAGS on either one and you will get plenty of hits. Or look up. "woodmizer"
"alaskan mill" "beam machine" "logosol" just to name a few off the top of
Like anything, you can spend a little or a lot with a wide range of results.
"Keep your stick on the ice"
Depends on the tree: If it's twisted you get corkscrew boards, if its
straight you might get straight boards with funny undulations where
I myself have only tried a few pseudoacacia and ash loglets.
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