Production-Ready 3D CAD for 40mm Round Titanium Watch Case (10-11mm Height)

I need a production-ready 3D CAD model for a round 40 mm watch case that stays within an overall height of 10–11 mm. The case will be machined from titanium/ stainless steel and should follow a clean, minimalistic aesthetic—no ornamental engravings, extra crowns, or sporty add-ons.

Your file should be ready for CNC or MIM manufacture, so please model any features normally required to house a standard mechanical or quartz movement of this size, including:

Movement holder cavity

Case-back fit with threads

Crown tube

Gasket seats

Respect realistic wall thicknesses for titanium

Surface transitions must be smooth enough to accommodate brushing or polishing.

Key Specifications:
Case diameter: 40mm exactly

Case thickness: 10-11mm total (slim profile)

Lug width: 20mm straight (for standard straps)

Lug-to-lug: 47-48mm

Lug holes: Standard 1.2mm, centered

CRITICAL: Threaded Top

External threads on upper case (for screw-on bezel/cover)

Fine pitch: 0.5mm

Thread length: 3-4mm

Flat shoulder/seat below threads

Crystal seat must sit below thread start

Crystal:

Flat sapphire crystal seat

Below thread start

Standard thickness allowance (~1.0-1.2mm)

Case Back:

Screw-down type with standard threads

Gasket seat included

Movement Compatibility:

For standard quartz chronograph movement (similar to Seiko V192)

Movement cavity must accommodate movement height ~5mm

Date window at 4:30 position

Stem hole at correct height

Deliverables Required:
Native CAD file (SolidWorks, Fusion 360, or similar)

STEP file (for factory/manufacturing use)

STL file (for 3D printing prototypes)

Dimensioned drawing confirming 40mm diameter and 10-11mm height limits

Technical drawing with all tolerances

Requirements:
Mechanical CAD experience with precision components

Experience with threaded parts and tight tolerances (±0.05mm)

Understanding of CNC machining requirements for titanium

Portfolio showing similar precision mechanical work

Must show previous CAD work (no generic proposals)

Budget:
based on proposal and right candidate

Timeline:
1-2 weeks

I will review the model against measurements and overall visual simplicity before releasing approval.