Many of the shorter logs were simply lifted in place. But the bigger ones (up to 16') were a bit awkward for that. Our homemade crane lifted them easily and rolled to the spot on its casters.

Here we are lifting our "log straightener" onto the latest addition. The logs were pretty straight, as wood goes, when we got 'em. Still, being ½" or even ¼" over a 16 foot length, while exceptionally straight, would leave a big step in our wall. Thus we need to straighten many of the logs.

 
... That's what this gizmo is for. It's just angle iron and doubled 2x10s, but with a car jack in the middle, it easily exerts enough force the bring a log even with those below. (See detail below).

 
    Then we just screw it down. Ta da!