I think surviving in a postnuclear wasteland hasnt much to do with skills and equipment. It's more or less a matter of luck who will survive.
Also i think guns are not that important. You would most likely not meet anyone in months. So as a raider you would most likly just starve to death...
It's possible to port a game without having the source. It's called recompilation. You take the executable and run it through a translater that translates the instructions of the source architecture to instructions of the destination architecture. Of course this is just the core of it, there is...