Before and After part two - this is how Pitts looked when I got it. ..

The roof had collapsed in on it's self.
But it hadn't been down long, so the logs were still in pretty good shape.

Nice clean corners.
Note the boards instead of 'chinking' over the gaps.
Notch is called a 'dovetail' notch.

I did end up replacing the bottom logs when I rebuilt it, which I usually do on most cabins.

When most of these buildings were built, they were never intend on being permanent, so were not built high up off of the ground. So it is rare to find a cabin where all the sill logs are in great shape.
And if I am going to add any height, I usually start on the lower logs.