A disassemblable formwork panel frame, comprising: a pair of longitudinal side beams; and a pair of longitudinal end beams, each end beam having an opening at each end, each opening providing access to a corresponding internal cavity that extends longitudinally from the opening into the end beam; and four first connectors connectable to the side beams, each first connector having a projection shaped and sized to slide longitudinally via one of the openings into the corresponding internal cavity; wherein the formwork panel frame has a disassembled configuration, in which the side beams and end beams are not joined, and an assembled configuration, in which the end beams are arranged parallel to each other and perpendicular to the side beams and are joined to one another by the projections of the first connectors, each first connector projection being longitudinally and slidably received in a respective one of the end beam cavities; wherein each first connector projection is secured in place by at least one releasable fastener securing each first connector projection against longitudinal sliding movement within the respective end beam cavity; the first connectors are separate components that are each attachable to the side beams by way of a mounting flange that is perpendicular to the projection; the side beams each have a first aperture formed transversely through the side beam at each end; and the first apertures are shaped to receive the projections of the first connectors, such that in the assembled configuration the first connector projections extend through the first apertures of the side beams and into the respective end beam cavity. a pair of longitudinal side beams; and a pair of longitudinal end beams, each end beam having an opening at each end, each opening providing access to a corresponding internal cavity that extends longitudinally from the opening into the end beam; and four first connectors connectable to the side beams, each first connector having a projection shaped and sized to slide longitudinally via one of the openings into the corresponding internal cavity; wherein the formwork panel frame has a disassembled configuration, in which the side beams and end beams are not joined, and an assembled configuration, in which the end beams are arranged parallel to each other and perpendicular to the side beams and are joined to one another by the projections of the first connectors, each first connector projection being longitudinally and slidably received in a respective one of the end beam cavities; wherein each first connector projection is secured in place by at least one releasable fastener securing each first connector projection against longitudinal sliding movement within the respective end beam cavity; the first connectors are separate components that are each attachable to the side beams by way of a mounting flange that is perpendicular to the projection; the side beams each have a first aperture formed transversely through the side beam at each end; and the first apertures are shaped to receive the projections of the first connectors, such that in the assembled configuration the first connector projections extend through the first apertures of the side beams and into the respective end beam cavity.