I have been reading over everyone posts here and I'm not sure what to make of everything.
I'm assuming no one here has done pre production before (which I understand it is very difficult to do so on a forum) but first we need to outline the various stages of the project before anything can be drawn up in a cohesive manner.
First and foremost is the rule set. This is paramount to anything else simply because there is no game without it.
When the rules begin to take shape then the art, setting, and theme can begin production as they have to rely on the rule set as the foundation. Sure you can create a bunch of assets before hand but without an anchor, but they will end up being oddly glued on "features" rather than something organic to the system. (The bright side to this is pnp RPG's are super forgiving of this so this isn't much of an issue.)
With the rule set around about 40% complete the designers can begin fleshing out mechanics and begin testing game play. (I know 40% is high but this is pnp)
At this point in time testers must test every aspect of the game and make note of oddities and ideas that could improve the system. (Remember its fallout not some triple A title to make everyone happy)
When the rules are complete and I mean tested and true, the writers can then begin forging story lines, grand plots, and other novelties. (Writers please use the game mechanics in the plot, story, and side quests. Otherwise it turns into a farce)
(Writers keep in mind you need to be able to deal with criticism well and be open to adapt or completely change depending on the given circumstance.)
For players and designers alike please bear in mind that this would be a RPG, so getting upset with players for not playing the story line 100% the way they are intended is to be expected and not frowned upon, if anything is should be rewarded.
For those who DM, don't crap on players when they don't play the game as intended. Only punish those who refuse to follow the rules.
tldr outline:
rule set
rule set taking shape, begin art, theme, setting design
testing while still generating rule set
rules finished
writing
play
I also suggest that a community member be voted as the leader of the project, where they could then split individuals up into groups to work on what they are accountable for. Until this gets organized this is nothing more than a lofty idea.
*note: Let writers be free to explore all manner of the world even if they don't fit with the main story line, I say this simply to prevent conflict and to allow replay ability for when players finish the main story line.*
Hopefully this doesn't devolve into a modded renraku arcology