Rails, uprights and baskets are made of simple and changeable unclosed profiles manufactured from 0.078inch sheet steel (sheet stainless steel is optional). The frame corners are manufactured with new-designed joints welded to uprights and rails for roof and bottom. Only 8 resistance screws are needed to mount the structures while position pins allow the easy mounting. flat pack for low cost shipping, as well as expedient assembly in state of the art facility right here in the United States