I'm not sure if you also wanted the gyroscope block to be free, but I set the gyro and camera mass to 0 and put them on the same piece. The settings on the gyro were too high so I reduced the values to what I usually use on my things
doing so stabilized the platform: 
Specifications
General Characteristics
- Created On Windows
- Wingspan 9.4ft (2.9m)
- Length 14.5ft (4.4m)
- Height 8.1ft (2.5m)
- Empty Weight 2,092lbs (948kg)
- Loaded Weight 2,590lbs (1,175kg)
Performance
- Wing Loading N/A
- Wing Area 0.0ft2 (0.0m2)
- Drag Points 2697
Parts
- Number of Parts 52
- Control Surfaces 0
- Performance Cost 469
