Project update - it's getting even more integrated.
After getting the motor skid bolted up under a 1997 Dodge ram 1500 and connecting the motor wiring, controller, and driveshafts I'm able to get a more accurate idea of the clearances and any unforeseen complications.
It turns out there is actually enough room between the motors and the cab to fit the controller as part of the motor package. I'm going to need to remove the welded top-plate between the motors because the controller needs to be sunk into the cavity a few inches. But it will fit.
And once the controller is built in it's only logical to integrate the reversing contactors and controller cooling system.
The only external connections will be battery input, throttle input, and 12v supply. Just like the Tesla drivetrain