The easiest way might be cloning the Engine from Github and changing whatever you want to change and compile it.
https://github.com/EpicGames/UnrealEngine
Another approach might be creating a custom Engine, this is a short tutorial:
I hope it helps.
The easiest way might be cloning the Engine from Github and changing whatever you want to change and compile it.
https://github.com/EpicGames/UnrealEngine
Another approach might be creating a custom Engine, this is a short tutorial:
I hope it helps.