All the talk about fixed thrusters, has me wondering about a practical way of rigging for control. I looked at Stanley's Idabel also, and don't really see much in the "down the hatch" view other than the MBT valves. Looks like the motor controllers are under the lip of the top sphere.
Looks like with Minn Kota, the Saltwater outboard mount 36V 202 lb thrust motor is ideal, and at 9k weight, probably what he is using in series there.
The fact that he "air compensated" is also of interest.
However, in looking at the rheostat control for this motor, it seems to me you need differential control of the various motors = a whole bunch of separate controls??
Problem for resolution.... How to rig control of the various motors (quite possibly 5) to make maneuvering intuitive and instantaneous, combine control where appropriate but, still maintain individual variable control??
Joe