Model 1: it is made of a steel housing filled with a technical panel on which holes for accessories are drilled. The housing is painted.

Model 2: it consists of a double layer, internal and external, with a technical panel in-between that joins the two parts. The outer layer can be increased in order to obtain an inclined side that acts as a handle. The inner shell can be made of aluminium to lighten the door. The whole structure is painted. Accessories can be fitted with inserts or fixed directly on the technical panel.