Modular structure systems

A method for joining shipping containers together to create a modular structure, the method comprising:

• providing a first shipping container and a second shipping container, each shipping container defining a side with four corners and an inner volume, wherein each corner comprises a corner casting;
• removing a wall of the side of the first shipping container to create a first opening;
• removing a wall of the side of the second shipping container to create a second opening;
• positioning the first opening adjacent and opposite to the second opening;
• aligning the first opening with the second opening such that each corner casting of the first container is adjacent and opposite to a respective corner casting of the second shipping container, the aligning defining a peripheral gap between the sides of the first and second shipping containers;
• after the aligning, securing the first shipping container to the second shipping container to create the modular structure by securing each corner casting of the first shipping container to the respective corner casting of the second shipping container to constrain a width of the peripheral gap;
• securing an inner flashing around an inner periphery of the first opening, wherein, when the first and second shipping containers are secured, the inner flashing extending into the second opening and covering the peripheral gap to define a portion of an enclosure of the modular structure comprising the inner volumes of the first and second shipping containers.