I personally think Fallout 3 is absolutely SCREAMING for a Terminator mod!
The whole atmosphere of F3 the way its all post apocalyptic and its all wasteland after a nuclear war and all, thats extremely similar to the Terminator films, when its based in the future!
Basically it would be cool if there was this:
-A playable Infiltrator Race (The Flesh covered Terminators which Arnold Schwarzenegger played as in the movies. They are known as Infiltrator Terminators. T-101 etc.)
-A playable normal Cyborg Terminator race maybe if it can be done

. (Not really important though in my opinion it would maybe be best as a new Enemy)
-The futuristic Terminator Weapons such as the Plasma Rifle and stuff, theres not much I think.
- The Cyborg Exoskeleton Terminators of the future as a new enemy. Imagine seeing them emerge in the wasteland with plasma rifles firing at you

, and with their red eyes glowing and stuff, now THAT would be awesome!
-MAYBE even the Terminator HK's/Hunter Killers which are them Planes that hover around the battlefields, and the Tank like Machines and stuff. Making it really as if you were playing an actual Terminator RPG
I personally think that would be a totally awesome mod as Fallout 3 is really Similar to Terminator.