Heavy-Duty Stacker & Pallet Truck Design

I am preparing to build a manual hand pallet truck and a manual stacker lift that can safely handle more than 2 tonnes. My workshop is fully equipped for fabrication; what I am missing is a complete, production-ready design package that I can release straight to the shop floor... (Budget: $30 - $250 USD, Jobs: 3D CAD, 3D Modelling, AutoCAD, CAD/CAM, Engineering Drawing, Manufacturing Design, Mechanical Design, Mechanical Engineering, Product Design, Solidworks)