I got a few photos and some measurements.

I found a mortise that I believe may have been bored by a shell auger, it does not have a feed screw hole in the middle of it. It is hard to see in the photo, but there is a small round depression in the top of the mortise.



This is the mark used for the brace on the second bent, east wall. The west wall uses the same mark, with an additional line above and parallel to the first. The third bent uses the same one line two line, but with a half-circle. The first and fourth bents have their marks hidden by the siding, I presume.



This barn has double tie-beams with passing braces. They are on 5'x5' layout.