Why not look into building something like this? https://www.reddit.com/r/gardening/comments/102g6ma/my_diy_potting_shed_made_mostly_from_free_doors/?utm_source=share&utm_medium=android_app&utm_name=androidcss&utm_term=1&utm_content=share_button

Much more attractive than a shipping container, unless you're going to do alot of work to the container. Probably nicer than an old bus or camper as well.