Shipping Container 20ft.

Public domain shipping container model by bhoult. Originally uploaded to Blend Swap.

“ISO shipping container. Sometimes called a Sea Box or Sealand container. Often used as a storage building or as a building block for non-traditional housing.”

The mesh doesn't slice very well, but it's a good reference model as all of the individual parts are separate meshes within the .blend file, so you can see how the container comes together.