1. Yeh, im sure i will do something like that:
.Groupe A:
  -UvH
  -V
  -ExR
.Groupe B:
  -MOB
  -M
  -Joker
If these are the groups, fights will be:
UvH vs V
V vs ExR
UvH vs ExR
MOB vs M
M vs Joker
Joker vs MOB
In this round, the 2 clans with more points go to the semifinals (4 clans in total) Fights will contain 3 rounds. In each round you can get 10 points, if you kill all your enemies with 2nd weapons.
Semifinals:
UvH vs V     MOB vs Joker
Here, the winner that go to the final match, is the clan that gets more points in the 3 rounds.
Example:
MOB vs Joker:   First round 6 - 3   Second round 8 - 1   Third round  5-4        TOTAL:  19 - 8 , The MOB goes to the final.
Final: exactly the same.
UvH vs MOB
2.This idea is really nice, but mine is more exiting. I know that V can be unlucky, and to have really skilled opponents in first rounds, but remember that looser from these first rounds will play in a Sniper Team Madness, so you all will play a lot.  Looser from semifinals will also fight for the 3rd position.
3. They will fight as team, of course, like a "gang base". 5 vs 5, in action. With that i want that all the clans think about tactics.