Modular display booth units are made from an upstanding bent sheet body portion located at its top and bottom in respective depending and upstanding lips of counter top and tray portions. Inside the body portions, rails extend from side to side. Hooked ends latch into latching apertures in the side wall and the side wall of any adjacent unit to link them together. Special angled joining units are provided to allow the units to be joined to form elongate assemblies of varying configuration.