thanks for the insights and technique points.
this 'double-cut' method sounds really interesting- a similar technique is sometimes used in log building with big logs.
would this be a good way to work with hewn timbers?
and then, with practice, at the height of wildness coupled with technical acumen, it will be all axes- tenon shoulders, mortises, dovetails, pegs. one sure hit with the axe and its perfect.