STL-to Precious STEP Conversion Needed

I have 07 Nos, of STL mesh of a mechanical part and now need a fully editable STEP/STP model so I can carry it straight into manufacturing. The scan captures every contour, so the converted file has to replicate that high-detail geometry while arriving as one clean, watertight solid—no residual mesh bodies.

You may use whichever reverse-engineering workflow you prefer—SolidWorks & Fusion 360, or similar—as long as the final deliverable is an industry-standard STEP (or STP) file I can open and edit without feature-loss.

Deliverable
• One high-fidelity STEP/STP file of the part, ready for CNC or injection-mould tooling.

Acceptance
• All surfaces joined into a single solid body
• Critical dimensions and hole locations true to the scan
• No self-intersections or open edges reported on import

If you’ve handled scan-to-CAD conversions before and can keep tight tolerances, I’d like to get started right away.