Names for the new positions
personally i think that each position is great, but they should be called something else, like instead of vice-leader it should have a name more relevant to the content of the game then something democratic, like it could be 1st Lieutenant 2nd Lieutenant and 3rd Lieutenant(b/c you said there would only be three in this place and the longest one in this position would obtian 1st then 2nd then 3rd). And then instead of elder it could be called Sergeant, then with the newbies to the clan they could be called Recruits, then after that one week is up they are called Private(Even though the name changes that member still gains no 'power' in the clan). The reason why I say it should be changed to these is so that it follows the relevant ranks of an actual real-life Army. I agree with everything else though that you said. And I love the Idea.