It might be possible but you would need to make more than just a model to get it working. I would think you would need to modify the current animations to fit your model, plus you would have to code the current Feralheart files or more likely make new ones. If you manage to figure out how to do all that and get the model working in-game, you may cause some players to crash or experience errors/glitches. I can't say if it's possible or not but I would imagine it to be a difficult task