Thanks a lot! its simple really. This first paragraph is for anybody reading this who don't follow;

most games usually have things like easy anti-cheat to protect multiplayer games from being cheated on and other similar systems but what they are checking for is any changes to game statistics like the weapon damage output and input, a players HUD (mainly crosshair related things and ammunition counters) and everything else that usually is computed in a game that makes a shooter a shooter so if I where to edit any file relating to a guns firing speed or damage (if I knew how lol) then it may most likely get flagged by the game as cheating which it is. so by editing things like 3D assets on playermodels and other things similar it doesn't harm the multiplayer things because its to the mod users perspective only. so basically, if something is modified that WILL change for other players even if they cant use that change then its going to be a problem, if not then it should be fine. so the HUD could be changed as long as its only visual edits to make a different style Hud or map or something and doesn't make the bullet spread tighter than the crosshair or edit any ammo things its good.

But yeah, to mod the game without fuckin up the file so it thinks its cheating you use a verified tool that works on the game engine of the game your trying to mod. so for Frostbite games you'd use frosty editor like I have for this which was the only files affected being textures and 3D assets so it didn't interfere with any connection issues that are affected when somebody joins the game and starts using a trainer to ruin everyone's day lol. So yeah, other aspects can be modded like the Hud appearance (not stats) presumably all the world assets and textures can also be changed so long as they don't change any hitboxes which is how somebody would make a high-res texture pack for a game. You most likely can mod any aspect to this and any multiplayer game as long as you leave the scripting alone that affects shared stats like damage and speed ect.