Studying it now... While I am looking it over, I'm going to ask the KISS questions...
Are you 100% sure the camera is powered on?
Are you 100% sure the camera is seated properly in the gimbal?
Is the gimbal stabilizing? (i.e. does it have power?
Did you test continuity from end to end of all the wires?
Can you take a picture of the IOSD plugged into the canbus?
Can you take a picture of the Gimbal connections and the vtx connections?