A dovetail and slot assembly made from panels comprising layered corrugated Kraft. The applications are multiple, ranging from items of furniture such as chairs, tables, benches, shelves, items for loading products, display units, and packagings. The assembly systems are also designed to be set up in such a way that it is practical and easy for the user without needing to use tools. It enables and facilitates the transport of the structures prior to assembly in parts arranged in a compact manner, occupying a relatively small space.