Ok. Let's just assume some things. Let's assume that I can actually use the Manta M8P and OV4689 module without the expensive PCB "middleman", and swap out the 125 degree lens for either a 41 or 28 degree one, as seen below:

Then from my research, I might be able to use a ribbon cable length up to 1m in length, but the shorter the better. The max distance from the Tool Bar to the Slime is likely to exceed that distance, but from the Y axis slider it could be under 750mm. From the X axis slider, well it's probably short enough of a distance to not even need an extension. 

If the M8P is on the X axis slider, the only semilong and long cables would be:

• Motors for Zmain, X, Y, Select, W
• Endstops for Zmain, Y
• 24V and 36V power
• Select servo signal wire
• Select RGB indicator signal wire, though that could be moved to the X axis and probably would be easier to see there instead of at the back on the Tool Bar
• Heated bed signal wires
• Heated bed thermistors
• USB to the other motherboard (M8P or OctPro)

It may also be easier to work on the electronics, as well as reducing the thickness of the Tool Bar, increasing the max tool depth. Additionally, having a nozzle cam permanently installed on both Slimes could be affordable and the camera data won't add traffic to the USB.

[E1] Just found out that the H616 doesn't have any MIPI-CSI at all, which is a shame. Even though a CM4 + OV4689 would've cost around about the same, apparently there's still a large stock backlog from last year. BananaPi's Banana Pi BPI-CM4 apparently wont show up on virtual shelves untill 22Q4 or 23Q1, but the chip it uses apparently can take up to 8MP @ 60fps. I can't tell if 60fps is a hard upper ceiling or it can be extrapolated somewhat based on bandwidth.