I have little experience hewing so I have some questions.
1. Were adzs actually used to smooth timbers? I occasionally read books which refer to how timbers were converted using a broad ax and then smoothed with an adz. However, all hewing marks I have ever looked at have an arc to the signature. I do not know how to swing an adz with a sideways arc so I presume all smoothing of the timbers was done with an axe. Here is a nice example from about 200 years ago in Maine.
Just one more photo. Here is a double gunstock post. I cheated by starting with a 10 x 14 and hewed the lower gunstock just to carry the girt in a barn repair. I am not aware of double gunstock posts being used in barns but there is precident in house frames in Connecticut.