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Photogrammetry is one. Generally results in messy geometry though and tolerances get finicky.

The CAD plugin in Blender is my favorite though. Need a caliper to get measurements and then I can build out my hooks/clamps/whatever. FreeCAD for when I just need sketches as I find the solid part workflow utterly confusing, whereas I'm very well versed in Blender.

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> Photogrammetry is one. Generally results in messy geometry though and tolerances get finicky.

The trick is a hybrid approach, use photogrammetry to get a draft model into whatever environment you use (like Blender or whatever), then use that for creating the high-quality cutout manually, which will be very easy with a in-place 3D draft model right in the scene.

I use Photopea. If you can get a decent silhouette you can do Image > Vectorize Bitmap to get a path and save it as an .SVG

Blender can import an SVG; then you can clean up the curve if necessary.

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