Nice thread and photos, ready to start building my next barn and your thread was a help. When I turned my small barn (30x40) into a motorsport shop, I ran metal studs around the perimeter and dropped the ceiling using commercial drywall track. That way I ended up with perfectly level walls and ceiling. This also allowed me to gain R48 in the walls and ceiling which keeps it nice and temperate here in Michigan. I am in a T shirt in the winter when temp is set to 60 and it's always 10 degrees cooler in the summer.