build a temporary exhibition room (stud walls - plasterboard or whatever recommended material) the size of a shipping container (600cm x 240cm x 240cm). Internally it needs to be clean and the walls totally smooth, outside the container the stud work can show so boards only need to cover inside walls. It won't require a ceiling but may require a floor. It will be built inside another building and we won't be able to attach or secure to their walls or floor so it will need to be freestanding.

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