It would seem the general consensus is CT (sorry, Serge), Musical, and multiman crew. Awesome.
The whole close proximity thing... that'll be tough. I mean, we meet through the internet. There are MILLIONS of people on the internet, and millions of places to be. The best way I can see this happening is through the actual forum. It's a common meeting ground and people can have all sorts of interest in it. Another way is through instant messaging programs, like AIM, MSN, IRC, and things of the like.
Now here's the next batch of questions for you.
1. How likely do we think we will get this project up and running? This could very well be a very bad idea and we could be trying fruitlessly for years and years, ultimately scrapping it after many many cast changes. Or, it could flourish into something amazing, like Crimson Echoes has.
2. Who's doing what? Who will write the play, who will write the music, who will write the lyrics?
2a. Will we have multiple people doing one job (breaking the play down into parts) or will it be one person does one job?
3. How will the playwright(s), lyricist(s), and musician(s) convene? Will we do it in this topic? Will we ask for a subforum?
3a. If we ask for a subforum, will we ask it to be a ninja forum like CE is? Or will it be one of them public ones, where people can drop in and give suggestions?
EDIT: I just thought of something.
http://www.youtube.com/watch?v=OaWB-0VkTXs&feature=related This would fit in beautifully! We'd need to get the permission from the original dude, but... this would be an amazing piece to fit in somewhere.