If you’re not doing it for profit, you can just take photos from many angles and use VisualSFM (google it) to create the 3d model.
Accuracy will depend on quality of photos and resolution. Use plenty light and keep it constant between shots (move the camera round the object, not the other way round) but mm level accuracy should be fairly easily achievable.
The output is a pointcloud which you can then mesh with various free tools, a rudder should work quite well as it’s an “easy” shape to mesh.
If you need more info than the above, that would be a long forum post, and you probably need to pay someone to do it…
FWIW it took my about a morning to go from no software to a scan of my desk.