Hmm... I could have sworn that no recruiting was allowed in the forums, but I guess the recruitment depot is down...
Anyway, I'm not trying to rain on your fire or anything (is that a saying?), but I wouldn't get your hopes too high for something like this. The fact is, I don't think there are many experienced modelers who are sitting around, waiting for someone to post an addon request for them to create.
Everyone is so addon crazy anyways... if you go look on the official forums, you will see like a dozen posts a day where someone says "hey, XXX model would be cool in game!" Usually nothing is done about it, but even if something is made, what is the point? No one uses these addons in missions, so it seems like a lot of work wasted, IMO.
I realize you want to create a campaign, so you would actually put such addons to use, which is great. If you can find a team to create the addons, and you released the addons & missions together, I would salute you. 99% of addons released today don't come with any mission at all, and half of them are never even used in other people's missions anyway.
However, like all things in OFP, you have to make due with what you have. Why can't you make this campaign with some existing female addon, or the BIS ones? Like I said before, everyone seems so addon-crazy, but truthfully, addons don't make a mission. Honestly, how much better is the campaign going to be if you have different models for the heros, instead of what is currently available? At least to me, I could care less. Most of my favorite missions all use default BIS stuff.
Good luck recruiting though.