i have a close idea, make a mod to turn the game like a "walking dead" world. replace all the ennemies by zombies, except humans, supermutant (a military vaccin turn bad), infected dogs. (no boss or legendary) keep the radiation system but rename it infection, and need antibiotic to be heal. make raiders and SM use more hand to hand weapon and less guns. make the guns rare and bullets hard to find or craft. primary needs eat, heal, sleep. ambiance more dark, creepy. ...