This isn’t strictly ARK related, however I’m interested to know if the devs could shed some light on how you build a dev kit so that it includes binaries, read-only blueprints, the editor, etc.
This would be a question directed to Epic as they are the ones that need to handle it. I would shoot an email to them and ask them directly.
The source for UE4(including the editor) is available for modification and download from github.