This video describes in detail the build process of the digital film cartridge.
Parts list (Amazon affiliate links):
Camera: https://amzn.to/3y6XOLUDC
DC converter: https://amzn.to/2VcUArT
Battery (alone): https://amzn.to/3kPnd9g
Batteries and charger: https://amzn.to/3BEVr5i
Raspberry PI Zero W
CADDesign: https://cad.onshape.com/documents/906...
(Account has to be created to copy, modify and download the design)