3D scanning with a camera (photogrammetry) probably won’t get you the accuracy you need for this piece. Since it appears to be a flat piece of sheet metal, the approach I would take is to take a photo of the panel as flat as possible to avoid distortion, with a ruler next to it as a calibration guide for size.
Then import the image into graphics software and manually trace the shapes using the vector tools. Inkscape or Illustrator, for example could be used for this, however Fusion 360 is also capable, and would save an import step. You can use the various sketch tools: line, arc, spline, etc. to do this. Here’s just one of many YouTube videos on the subject. Fusion also make it really easy to scale to sketch to the correct size.
I find this to be a pretty easy way to make accurate copies of relatively flat pieces such as knife scales.