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. Every feature must carry exact dimensions and tolerances, so the model has to reflect real-world manufacturability rather than just visual appeal. I will supply hand drawings, key measurements, and functional notes; you translate them into a fully parametric model in SolidWorks, Inventor, Fusion 360, or any comparable professional CAD platform. Acceptance criteria • Native CAD file plus neutral STEP/IGES export • PDF drawing pack with critical dimensions and tolerance call-outs • Model passes a quick fit-check review on my end (threads, clearances, mating faces) Once approved, the files will go straight to a prototype shop, so precision is everything. Budget: INR 750–1250