get a backhoe, a few dump trucks, and some friends. Then get the cargo container, Dig a hole big enough to hold it them plus 6 feet deeper so its underground a ways. Then go to the store, home depot or lowes and get a a 1 1/2 foot diamater black pvc coulvert pipe, thats around 7 ft long. Drill a hole in the cargo container to fit the pipe in, silicone that fucker up, you wont want bugs and shit in there, youll also want to do this to the inside of the cargo container. Then bury the container and plant grass seed so there isnt a bare spot in your yard. Then, to get in , all you gotta do is slide down that tube. Then to seal it, put a cap on it, they sell them for that pipe specifically. Noone will ever question this. For all hey know its your septic system vent. Better to put your growing supplies in the cargo container before you bury it, youll be pisse if the supplies wont fit down the tube.
Ok im thinking of ways to grow outdoor year around.. I checked out pods (portable on demand storage) they have translucent ceilings and nice locks. Im wondering if the light transmission through the cieling will be sufficient to bud.. plus using suplimental lighting to extend the short days of winter will make the ceiling glow like mad.. there has to be a way to make this practical. Anyone have experience with them? pods...? anyone? 
peace out