Are these zones going to be mono or stereo? How are the speakers wired? Parallel, series, combination of both? I see a lot of amp channels needed depending on wiring and impedance matching involved. What model speakers are in use here? Doing some of these zones at 70v wouldn't even be out of the question.
Am I reading that right? 48 speakers total in the theater? Is that 12 speakers @4 ohms each, or 12 speakers totaling 4 ohms? I'm assuming original quote spec'd a few of the Elan 1616s?
It's hard to help when you won't say what the budget is for this. What's the dealer's options for going cheaper? None of this is even close to rocket science, but if this isn't your wheelhouse I would suggest not being the one driving the clown car when it hits the wall