Model Swap in Remnant From The Ashes

[DracoParadoxVi]

I re-installed Remnant lately and I got the Cammy mod for the game, this one:

https://www.nexusmods.com/remnantfromtheashes/mods/68

And I was feeling tempted to learn how to mod it myself to made a model swap like that, but with Poison. I tried to following tutorials for modding UE4, Remnant, and extracting paks. But I keep hitting dead ends. Like, at first I couldn't extract the SFV paks with fmodel, but I managed to extract them with Umodel and a script I think, but the script only extracted the molotov's and whip's meshes, not her body, and I feel pretty overwhelmed

I did my best trying to google a tutorial on how to rip models and make model swap mods for UE4 games but I couldn't find anything. I have basic knowledge of 3d modeling and 0 gaming dev knowledge. So what I'm looking for it's for a little bit of help and if someone can give me a little guide on how to make a mode like Cammy's one but with Poison

(I know I could try to comission the mod, but I live in Argentina, so anything above like 20 USD equals like 1/4 of my salary so it's not really an option sadly)