This is an awesome idea!
I don't have any experience with H6 (yet), but if this can all be done, I'm surprised MDI hasn't thought about doing something like this already. (or maybe they have?)
Some thoughts from a regular PSC player:
There was a lot of PSC artwork salvaged from the game through screenshots. Weapons, player stats, zombies, misc. items, etc... We are still working on finding good ways to share these images though, so you have to ask around.
Would factions make sense to line up with PSC strongholds? There were about 25 popular ones at the end of the game, plus many, many older ones that had storied histories.
There are definitely writers in the community too if you go that route. I think you'll see significant support for something like this. At least I hope you do.