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Not modding, physically changing the files. For example, you copy your custom model, then paste it into the folder with the original file, like the MK 4 swordbot. Then, you delete the MK 4 swordbot model, and you have your own custom model for the MK 4 swordbot in your own game.

Ya that's what I meant. I don't know if that's possible, or if it would mess up the gameplay.