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If you wanted another way to do this, a cheaper and lighter way.
Get 5 cameras that have the older shutter release (non digital, not sure if this one would work) and 5 Samyang 135mm F/2. The reason for the older style shutter release cable is that they can be operated without a powered shutter release, camera powered.
You have one camera that is tethered into the software using a DSUSB connected to the shutter release. You split that shutter release into 5 so that it can be plugged into all 5 cameras. As the shutter release activates the exposure in bulb mode you only need one camera to be activated for all 5 to be controlled and synchronised.
If you don't guide (just have good PE and PEC) you don't have to worry at all about precise alignment as it is the guider that causes differential guiding errors. They are best when they're not even correctly aligned as it is a natural kind of dithering between each camera, you do still need to dither.
I say 5 cameras as these can be mounted on the largest/longest Losmandy/ADM plates without too much of an issue. It'll be tight but should fit.
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