you might want to do a little bit more woek before you start looking for help. you have an nice idea and your overall intentions are quite clear that you want a realistic game based on real battles of WWI but you have no information on how you plan to implement anything. how can u expect people to comit to something so open they dont know what they are actulay making
you want realsitic battles
so how do you intend to implent this from a character standpoint
-anyone can use any weapons rather then having class specific
-increase the class divides making each class more destinctive like real soldiers roles in battles
-give players xp in fileds making there more customised to there own tastes so someone who often plays sniper will be better with the sniper since that is what there player has practices for the last 2 month of play where the areas he has not procticed will be poorer like land mine difusing
im not saying that you need a 100% solid idea before you go onto the develpoment of couse some thing will be changed and modified during the development process. but gather people to start working before you know what you realy want mean there gon produce a lot of unneeded work and waste time or your mod will be made from random pices pasted together that might not fit too well