Abstract: The present disclosure generally relates to an elongated section (101) for construction structures (300). The elongated section (101) comprises a plurality of sides (102), each side (102) comprising a first retaining channel (104) and a second retaining channel (105) adjacent a respective corner (106) of the elongated section (101), the first and second retaining channels (104,105) being a minor image of each other. Each retaining channel (104,105) is configured for engaging a respective retaining member (201) for supporting a structural panel (301) between the retaining members (201). Each retaining channel (104,105) comprises a channel slot (197) extending perpendicularly into the side (102), the channel slot (197) for engaging a first end (204) of the respective retaining member (201); and a channel end (198) opposite to the channel slot (197) for engaging a second end (206) of the respective retaining member (201).