Abstract: An improved mobile workshop system for manufacturing, maintaining, inspecting, servicing, or testing downhole equipment, which provides a structure having four walls, a top, and a floor portion, the structure having the capacity to be transported as a closed container or box to the work site. Within the structure is provided a plurality of stationary machinery items, such as hydraulic vises, floor jacks, and hydraulic tongs, the machinery items mounted to the sidewalls of the container; thus, providing valuable tool and equipment storage space on the floor of the container. There is further provided a retractable crane system along the top interior of the container, so that when the container is placed on the job site, the walls of the container may retract from the vertical position, as container walls, to the horizontal position, lowering the machinery into operational position upon the horizontally positioned sidewalls, now defining the secondary base of the workshop.