Rob, when I first saw a picture of your roof slope my concern was that with it sloping down to the side that you will load logs from. That it may be a bit on the low side for setting logs inside with your tractor. Have you had a chance to make sure that you can lift the forks all the way up under the roofline? Hate to see a hole in your new roof.
Motor seven, about the only time you should need to put in the removable center post is when there is snow in the forecast.
All three projects are looking good. However, Rob is cheating by milling them logs two at a time.