A bob weight within the fuselage to measure AOA????
Not sure what school of aerodynamics the supervisor came from.
A bob weight in the fuselage would be subject to errors when longitudinal accelerations / decelerations take place, unless the sensor is perfectly aligned with the flight path; it would be subject to errors in turns, and turbulence might also affect it in unusual ways.
Stick with something that measures the angle of the airflow. No more complex than the bobweight- it just has to be put outside the fuselage.