I've had this build on my to do list for 25 years at least. When I hit 60 I decided that if it was going to happen, I had better get going on it. I've been stockpiling pieces of the puzzle, both materials and ideas , but farming, family, and other obligations took priority. Jan 2020 was my start up month. I took my skid loader around to the back of the barn and picked up the 12 ft piece of 30 inch spiral welded casing I had saved for years and set it on roller stands in the shop, then the fun began. The spiral weld created a unique problem that caused me to swing back and forth on cutting the doors. After sketching out several options, I came to the conclusion that this was going to be something different, so instead of fighting the spiral weld. I would go with it. I will try to post several pics to show the progress to date. One positive result of the corona virus fiasco is that I've had more time to work on it.