tl;dr : large single power supplies not a good idea - sorry.
Big power supplies. In some ways, the holy grail of mulitcam rigs. Get rid of all the individual 5"x2"x1" battery eliminator power packs with their 4' AC cords. (sorry for the American units).
But here's the problem. For 66 cameras you would be looking for a power supply that can put out 100 amps at 4.3V! Even if such a thing existed commercially, it might seem like overkill as surely not every camera will be drawing maximum power at the same time? Maybe - but when you shoot with a multicam rig, they will all be moving motors, charging flash units, shooting, and saving to the SD card at the same time. Their times of maximum power consumption will all be synced. Bad news that.
And there is an even more important consideration. The interconnecting low voltage wiring. Simple Ohm's law - as the current goes up, so does the voltage drop down any connectors. So to make this work, you either need a set of 66 power cables all leaving the power supply in parallel, or less conductors shared between cameras that must be of a much thicker gage. And it does not end there. Each power cable is effectively a transmission line, with its own resistance, capacitance, and inductance. When you are only powering one camera that does not matter a lot. But when you have multiple cameras in parrallel, it counts and can cause nasty interactions between cameras as high frequency current variations start to take effect. Sorry to say that I've been there, done that, got the t-shirt.
And then we need to talk about grounding. And ground loops - something you need to deal with even with 66 separate power supplies.
Complicated stuff - I've been dealing with this sort of problems for a very long time.
So my advice? Keep it to your arrays of six cameras that are located closely together ( max 5') on a single supply. Use a power supply that can push out at least 10 amps peak at 4.3V.
A better solution might be small DC-DC converters mounted at each camera that can reduce a shared 9VDC-24VDC (the higher the voltage the better as current drops are reduced that way) to 4.3V at each camera. If you get DC-DC convertors that can handle 12V DC input then you can probably hook up 20 or so cameras safely to the same bulk DC supply. Just my gut feel here BTW.
Grounding is another challenge. Once you decide on power sources, we should dicuss that too. Doing it wrong here can result in anything between intermittent cameras shutdown issues and strong to fatal electrical shocks.
I know your were hoping for a link to a web site with a power supply that would solve all your problems. I don't think such a thing exists. And even if it did, the interconnecting cable issues and grounding problem would shut you down anyway.
Sorry.
