Clean rebuild of working 3D prototype into production-ready CAD

I’m looking for an experienced CAD engineer or product designer to take my existing 3D design files and rebuild them properly from scratch, ready for production in metal.

Background
• I designed all parts myself and have already validated the functionality by 3D printing and physical testing
• Everything works, but the CAD files are crude and not production-ready
• Tolerances are largely guesswork
• Parts were developed iteratively by adding and removing features, so many models are a hodgepodge rather than clean parametric designs

What I need
• Recreate all parts cleanly in a professional CAD system
• Apply sensible, engineering-grade tolerances suitable for CNC machining in aluminium
• Produce fully constrained, parametric models
• Assemble parts where appropriate to check fit and function
• Deliver clean STEP (STP) files suitable for manufacture

Workflow
• I would want to 3D print the rebuilt parts first to validate everything before committing to metal
• Expect some iteration after first review/print
• I can supply existing STL/STEP files, photos, and functional explanations

Ideal candidate
• Strong mechanical CAD experience (SolidWorks, Fusion 360, Inventor, Creo, or similar)
• Comfortable designing for CNC machining in aluminium
• Able to think like an engineer, not just redraw geometry
• Experience rebuilding rough prototypes into production-ready designs

Please reply with
• Brief overview of your relevant experience
• CAD software used
• Examples of similar “prototype to production” work

This is a serious engineering tidy-up rather than a simple file conversion, and I’m looking for someone who enjoys turning working prototypes into elegant, manufacturable designs.

Next steps
Once I’ve reviewed responses and shortlisted suitable candidates, I will ask for a simple NDA to be signed before sharing any detailed files, drawings, or samples.