Flat pack Module Flat-packed modules produced by Dorçe Prefabricated are not only easy and quick to assemble, but they can also be installed in hard-to-access areas. They are easy to erect and cost-effective to transport. Flat-pack is the term given to units that provide a transportation advantage by placing the walls and other components of the building horizontally between the chassis and ceiling coverings that create the main structure. These units can be stacked on top of each other. The advantage of the flat-pack modular system is that all conditions are controlled due to the manufacturing process taking place more..