Willow Valley Engineering offers a design and build service covering steel work, pipework systems and skid units. Our skilled workforce is experienced in fabrication, sheet metal, structural steel and pipework systems. Structural The design and manufacture of access platforms and steel support systems. Skid Units Manufacture, testing and commissioning of skid units in our workshop facility. All skids built to your individual specification. Pipework Pipework manufacturing using stainless steel, mild steel, poly prop, PVC and ABS.