3D Model Golf Putter Head

I have sketched out a simple golf-putter head and now need it translated into a clean, watertight CAD model. I only require the basic outer geometry—no textures or minute engravings—so this should be a straightforward modelling exercise rather than a realism project.

The model must be suitable for both additive and subtractive workflows. That means wall thicknesses must be consistent, under-cuts called out, and all edges joined properly so I can take the same file to a 3-D printer for PLA prototypes and later hand it to a CNC shop for metal machining.

Deliverables (all files exported from the same native model):
• Native CAD file (SolidWorks .SLDPRT or Fusion 360 archive)
• Neutral STEP (.stp) for the machinist
• Printable STL verified as manifold

If another format streamlines your process—OBJ or FBX, for instance—feel free to include it as a bonus. As long as the geometry remains true to my sketch and dimension notes, I’m flexible with the software you use (SolidWorks, Inventor, Fusion 360, Rhino, etc.). I’ll provide reference images and key measurements once we start; please keep an eye on tolerances so both printing and milling go smoothly.