Over on MTF there was a guy that used two shipping containers to make a barn. He put them on a gravel base, set them about 12 feet apart and then mounted gambrel trusses on top of them. After sheathing everything in, and putting doors between the two containers. He had a decent sized barn
What this did was leave him enough room between his containers to park his tractor and a few more things in front of it.To the right and left of the tractor he had two storage rooms, 8 feet wide and 40 feet long, with a ceiling, floor, doors and was even insulated. With the roof trusses bolted to the tops of the containers, he had a huge loft for hay.
I am not sure if you could frame in a barn entirely for what he has into his barn or not? I would think the shipping containers would have to be some cheap to compete. But at the same time, you are getting an 8 by 40 foot space that is insulated, has doors, a floor and ceiling.
I doubt I will go in that direction, but I did think it was a cool way of thinking with a box as it is.