Interesting build and nice old truck! What did you use for footings for the pillars? Also you say "large"........I said the same about my shop and it's 24x28.......now I wish I had gone twice that size. lol
The footings consist of 12 three-foot-deep concrete-filled postholes, in which are set lengths of 3"-diameter, 3/16"-wall steel pipe. The columns are poured around the pipe and the pipe is also cement-filled.
My shop is the building next to the carport. I'm hoping that parking as many cars as possible in the carport will give me a lot more space in the shop.