All assets/code related to Satisfactory (found under Headers & most of FactoryGame/Source/FactoryGame) are under copyright for Coffee Stain Studios!
Brabb3l deserves most of the credit for showing us this Unreal Header Tool magic is possible! Check out his work on pak mods (you will need some of the files there too)
FactoryGame is the Unreal Engine 4.21.2 project which contains all the blueprints in the game version 101665.
Headers contains the CommunityResources\Headers.zip, a bit modified, and the generated cpp files
ImplementHeaders is a C# program which generates the above cpp files
After cloning the repo, download Wwise (it is free for non-commercial use) and integrate it into the FactoryGame UE4 project
After that, the steps are the same as in the instructions in Brabb3l's project