I carried out a secondary design based on Dizzee78's Raspberry Pi Waveshare 5-megapixel OV5647 night vision camera module

Hardware requirements:
4 M3×12 screws

I easily machined the thread on the casing, and the threaded hole is flush with the back of the casing. If you want to use longer screws and install several M3 nuts on the back, it all depends on your personal preference or the accuracy and quality of the model you're printing.

Update: Two new versions have been added, which can be used with the Pi Cam equipped with a larger-sized circuit board - both of these versions are based on the Monkeybear bracket and have been modified for secondary use.
Among them, V4 is slightly larger than V3, because the PiCam I have on hand cannot completely fit into the size range of the original Monkeybear bracket.