The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
4DC_FAF_Release_V0.1 (2014)
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Google Drive: https://drive.google.com/file/d/19-n4ErqJDaSLT-aGwZvVOk4RX7rz9SmX/view?usp=drive_link
Video https://www.youtube.com/watch?v=4XA7mBDGvnI
If you haven't already guessed, this mod is not going to be compatible with the current iteration of FAF. My posting here is for those that wanted to know how it was done, and thus have my permission to use what's posted here as they see fit without my support.
Cheers!
Resin