To shed some light on this "mod" it switches the MP biped character to the SP master chief biped. Which in turn takes the hit boxes and biped layouts, and bone structure of master chief from the single player to the multiplayer which provides cooler looking shields, a little bit cleaner hit box, unfortunately it overrides user biped settings so anyone who is an elite will be switched to this biped by default, and as well for the best perk because of the better hit boxes shots register more frequently and hit detection is less. I wish more server owners would ask us for this mod but alas they do not.
Now you know
If you guys would like a client sided one just ask although it is connection host based, not party host based soo if someone steels connection host kindly ask them to download the app and run it.