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.