Our builder Rick does a lot of curves on his cabins. Sure frames the view nicely, non?
Note the channel cut into the window opening. Because the logs shrink over time, all of the windows and doors float within their openings: a metal bracket is inserted in the groove which the window or door is attached to. Rick and his helper John come out occasionally to tighten the metal rods that run from the roof to the basement. We think the cabin has already dropped several inches. Sometimes you can hear the shrinking in action via loud popping sounds.