To add my contribution, I think this idea is good, catering for those who want some competitive fun.
Having met and played most of those who are likely to be involved, its also a good opportunity to catch up too, amidst the rest of the gaming season, of course!...
As for format/suggestions...I think 3 per team is probably the most practicable...as its more inclusive and for some people who's cars are small, its more comfortable to fit in 3 than squeeze in 4 plus models etc!
I'm looking forward to a great 2012 of Malifaux...and my new crew!... Lets put MK centre of the Map!! lol