Hi Mike and Gizmo2,
I live in Florida, but the barn is in Georgia at my cabin. We have had numerous tornados over the past 10 years in and around are area. Reason's for the block, at a later date I want to put decorative stone on the block to dress it up. I feel it looks better because of the splash back from the drip edge, and most important, I anchored everything into the foundation to assist in the storms we have.
As for the doors, you don't have to worry about lossing space because of tracks, because there are no tracks. All of your hardware is bolted to the 6X6 and not into a 2 by, thus no hole in the tin. When the doors are up, it gives you a clean look and when they are down, they are VERY secure. Hope this helps, I will be in Georgia over the New Year, if your really want to see more pics, let me know. You all take care and have a Very Merry Christmas and a Awesome New Year!