I've done a few tests and the "Ghost City Raiders" game seems to be fairly sound. Time to push the envelope a bit when it comes to storytelling.
The basic path to follow would be a cascading set of scenarios, it's the simple railroading method of RPG storytelling.
Scenario 1 (introduction) leads to Scenario 2 (build-up) and then to Scenario 3 (climax).
As an example...(1) the characters find components, (2) the characters combine these components [or fend off attacks from other players while someone else combines the components], (3) the characters test their final products against one another.
This could apply to finding vehicle parts, finding herbs and holistic supplies, healing an important local elder.
Now it's just a case of inserting these concepts into the structures already in place.