Fabricio,I am sure that you have noticed there are literally dozens of books on shipping container architecture. Many describe space layout, design and construction means and methods which are all very important. There are also hundreds of images to stimulate the imagination.Most builders prefer the Hi cube containers as they increase headroom. Containers come in grades - New (one trip) - CWO (cargo worthy) or WWT (wind and water tight). WWT comes in grades A and B. WWT Grade A is usually the best choice for building and storage as Grade B are rated as damaged. Some commercial facilities may use one trippers as they do not have a lot of surface imperfections. The most obvious difference between New and WWT will be the price....Stairs are a critical item for structure. Cutting the floor system in a two story unit for stairs is not a good idea. Stairs are generally placed on the outside of the container envelope. Look at the images and you will see this is almost universally the case. Shipping containers can be turned vertical and stairs or elevators built inside for towers or multi-story units. This is not common but is possible in commercial or multi-residential applications.
Full container sides can be opened and two containers put together for greater width in the space. Containers can be spaced and a structure built between for the Great room concept or industrial space. Stacking of containers can be done in multiple ways - directly on top - staggered - or perpendicular.See my post below to John for more detailed structural information.Places that are quite wet and humid may need to have improved exterior coatings to prevent rusting. Check with local practices for coatings.Good Luck!Rich
ICC G5-2019 Guideline for the Safe Use of ISO Intermodal Shipping Containers Repurposed as Buildings and Building Components