Boom element, particularly a cabin or a berth in a ship

A room structure for use in a supporting structure having a deck, the supporting structure also providing sources for one or more of electricity, heat, ventilation and like services for the room structure;

• the room structure comprising:
• a plurality of self-supporting wall members for standing up from the deck;
• the wall members meeting adjacent ones of the wall members to selectively define one of continuous straight walls and intersecting walls;
• the wall members having lower ends, flanges at the lower ends, and means for attaching the flanges to the deck;
• the wall members having upper ends;
• means for interconnecting the upper ends of the adjacent wall members where they meet for defining the continuous straight and the intersecting walls;
• the interconnecting means comprising longitudinally grooved members shaped for receiving the upper ends of the wall members for holding adjacent wall members together;
• a roof comprising a plurality of roof members extending across the room between opposite parallel wall members wherein a first one of the plurality of the roof members for a room comprises a ceiling plate and another of the plurality of roof members comprises a beam;
• the beam providing a support for the ceiling plate, the beam further comprising a carrier for sources for electricity, heat, ventilation and the like;
• the grooved members being of lengths along the upper ends of the wall members that the ceiling plate first roof members rest on the grooved members while the beam does not rest on the grooved members.