Sounds like a lot of speakers unless they can be smaller drivers. I am designing two line array speakers for my home theater system. So far I have purchased 46 mids. I will probably pick up 46 or so tweeters, then maybe just 4 subs. That adds up to about 100 drivers but only 2 speakers. It depends if the 3D effects can be made with drivers only or if they need, as I would guess, full range (maybe just mids/highs as low bass is omni directional) for each 'speaker'.
I am in experimental mode again. I am dabbling in designing a Line Array. Here are some early drawings of my design. Not much to look at, but then again I am just starting. =)
It's now up to (24) 4" mids.
I think I will need to go with (2) 12" subs to be able to even come close to matching the output of my mids/highs. In a line array they get around a 10dB gain. (if I remember correctly)
I am still undecided on my tweets. I have 6 different ones now to see what I want to use. I think I will not go floor to ceiling though because of the beam like nature of high frequencies. They don't couple with each other like midrange does. I think I will just go with a 4' array or so, but I need to do some more research.
Once I get my old site up and running, I will post a great short whitepaper on line arrays. It is a very simple read that explains how and why a line array works as it does. Very cool stuff.