(57) The edge of a side wall (23) of a cabin is brought into engagement with a floor (25) or roof (16) and retained there by extrusions (35, 36), one (35) of which is secured to the floor, while the other (36) - secured to the edge of the side wall (23) - slides up a ramp (48), over a plateau (38); and into a valley (59) formed on the one extrusion. In the engaged position (Figure 9), there is horizontal location [possibly using an added stop (43)] and only limited freedom of relative vertical movement by virtue of cooperating hooked portions (45, 46) on the two extrusions. A shelf (47) opposes entry of moisture.
The engagement means, and the hinge of Figures 4-6 enable a cabin to be bult from pre-formed panels by hinging and pivoting.