Functional Product Prototype 3D Model -- 2

I have a new product concept that now needs to move from sketch to a manufacture-ready stage, so I’m looking for a 3D artist who can turn my references into a precise digital model aimed specifically at prototyping.

The goal is a product model that captures all functional details—mounting points, mating surfaces, internal cavities, and any simple mechanisms—so a prototype shop can use it straight away. Cosmetic textures or high-end visual effects aren’t important at this stage; dimensional accuracy and clean, watertight topology are.

You will receive:
• Hand-drawn sketches, overall dimensions, and a short feature list.
• Notes on critical tolerances and assembly clearances.

Deliverables:
• A fully-closed, scale-accurate 3D file (preferred formats STEP and STL; let me know if you need others).
• A low-resolution preview for quick review before final export.
• One round of minor revisions to iron out fit or clearance issues.

Acceptance criteria:
1. All specified functional elements modelled within ±0.2 mm tolerance.
2. Exports open without errors in Fusion 360 or SolidWorks.
3. Face normals consistent and model watertight (no non-manifold edges).

If this fits your skill set in CAD or solid modelling, please tell me which software you’ll use and share one example of a past prototype-ready product model.