Got a lot of questions here for you. First run on this site, so bear with me.

If Ogden reached the technological level of the modern day, what could remain beyond the limits of Eden?

 Is it possible for mechanical devices (specifically a vehicle, such as a tank) to remain intact if not exactly functional and if so, is it at all possible or acceptable in the OOC terms for them to be restored to function?

Can runes be inscribed into metal and used as a type of armor (to protect a vehicle against elemental assault for example) or as a weapon?

Could what remains of the Old World be feasibly repaired?

Assuming that the second question's answer is 'yes' (in some fashion), would it be appropriate or acceptable to run a character who has, to some degree, learned to restore old technology and managed to get a vehicle (Okay. Let's be honest. A tank.) running in some limited capacity? I'm not talking 100% battle-ready, rearing-to-go. But to a point where it could be considered 'working', or at least mobile.

The character I would like to run, assuming you find it agreeable, is someone living out in the Wasteland who has no mind nor power for magic whatsoever, and instead relies on the more conventional, physical forces to accomplish a given task, using machinery instead of supernatural power. Without the ability to call upon magic he or she will have had to deal with threats and hardships by learning about and repairing or modifying the tools of the Old World to weather hardships or survive threats. This character- (the 'Engineer' since I lack a proper name for them at present) will, in all likelihood, inhabit the ruins of the Old World, or as near a thing as they can find.

I don't know whether this Engineer would operate on their own or in a group or settlement... that much can be determined later. I want to see what you folks think of this idea and, moreover, if it's feasible to you, before I start to delve deeper.