Keeper Plot

Alright, I'm going to ask for some additional, possibly-very-important details about the world, the timeline, and the Keepers.  Unless stated, none of this has anything to do with site mechanics.  Many, many questions will be asked here.  For the most part, simple answers will do.

First off, the timeline:
Exactly how old is the recorded history for this world?  I mean how many millennia?  2?  10?  100?  Is there an implied beginning to the world x number of millennia before the current day?  I tried to leave Sera Mothello's timeline somewhat vague to try to fit it into this timeline, but I can't be sure I'll keep that up.
How often are Keepers changed out?  How many have there been?
Are the keepers that we play going to suddenly come into the role of Keeper, or might the character have been a keeper for a while now?  This leads to the next question.

Keepers:
How is a Keeper introduced to the role? -- Simple question.  Not a simple answer.
When is a Keeper replaced?  Can they snap and their thoughts turn...not genuine..., causing Lucis and Eraba to remove them from the position?  Or are they only replaced when they die?
Are the replacements chosen from birth in some large plan, or are they chosen for who they have become rather than who they will become?
You stated that the Keepers are placed in the world chosen as teachers and guides to members of their own element; Would this be someone like Mister Miyagi, teaching individuals one at a time?  Or could the set up be like Frank Lloyd Wright and his institute for budding young architects, teaching a few dozen to a few hundred pupils at once?  The dwellings are castles after all.
Do the keepers gain their severe elemental power after they become Keepers?  Or do they have it already?  Kind of going along with when during their lifetimes are they chosen.

World:
In the Rules, you said the timestream is mildly flexible, and we can hold multiple meetings/conversations/IC Threads at once.  I'm wondering how far that applies.  I can't really imagine a character talking to someone at the Lethe at around the same time as they're meeting another at the Crimson Swamp, unless the world is very small, and it only takes a few hours to get between the two.  End all be all of that, could we possibly get someone to make a map of the known world?  It would show which areas are more likely for the characters to interact in the two places at closer times.
Apart from any practical use of the map, there's the site aesthetic and a bit of psychology there.  People might visualize the world more clearly if they can see how it's laid out.
A more detailed example of mapping: The two tallest towers of the castles of light and dark can just barely be seen from one another.  Is that across the huge, flat, poppy field, or over the tops of the trees in the foggy forest?
Are the castles going to be run as they actually were in the medieval ages?  With rulers, merchants, peasants, nobility, and their upkeep depending upon the run-of-the-mill NPC citizens, some of whom we may control briefly in conversations?  Or will they be more like those select older Disney versions of castles.  Ghost towns where the only visible movement is from recognized characters?(Think Cinderella(her house had a few dozen servants in the old stories), Mulan(You'd think they'd still have guards inside the palace during the celebrations.), Aladdin, etc.)  I suppose the same question goes for towns and villages, though I have no movie references to cite an inconspicuous lack of people.  I'm primarily thinking of the show "Merlin," and the dozens to a few hundred extras they have milling around Camelot all the daylight hours, as an example of good background fillings. Yes, this will require a descriptive answer.
How is the edge of the world set up?  Are there all-but-impassable boundaries at some of the places?  Or can a character travel that way, but not play that way?

Site Mechanics:
For keeper auditions, (based on the last timeline question), should we put Keeper as the 'job'?  Or, again, should we apply as though our characters just fell into the role.
What would you do if someone wanted to use Barack Obama as a faceclaim?  Or anyone similarly extremely famous.  Would that be too much?



I think that's exhausted my questions for now.  I'm bound to have more as these are answered.  And holy crap... it's four in the morning.  I've got to be up by eleven, thankfully, rather than five, but still. Best not to let my parents know I'm up this late. And they do have to get up soon.