It sounds like so much fun! I have heaps of ideas swimming 'round in my head right now. I'm not qualified to be an organiser either, but if someone's willing to step up to the plate, just give a hollor and I'll sign up right way!
Oh, one question, what TYPE of lunch box are we talking about? I know that in some countries, you get the bigger, chunkier, metal ones that could fit in food and a bottle of some description, but in others, a lunch box really just means the stuff you put the food in, like the tiered variety they have in some asian countries. As there could be a significant difference in sizes (and amount of stuff that can be put into the lunchbox), I was just curious.