Precision 3D Prototype Modelling

I have a product concept that now needs to move from sketches into a production-grade digital form. The core task is to build a highly accurate 3D model that a machining or additive-manufacturing shop can use to create the first working prototype... (Budget: ₹750 - ₹1250 INR, Jobs: 3D Design, 3D Print Design, 3D Rendering, AutoCAD, CAD / SolidWorks, CAD/CAM, Solidworks)