Is it OK/possible to use just the basic construction of the container and design it further or does the final design need to be a cube?
We definitely do not want to restrict anybody's ideas and imagination. We are encouraging you to find a visually enthralling, aesthetically pleasing solution and a functional design, while using the materials listed and respecting the rules and regulations in the brief. As long as you keep in mind that the construction, assembly and transportation of the whole object should be modular, light and easy, the modules are your basic outline for further innovation. If your project meets this criteria, it can take any form you envision.
and join the challenge!