@Stevie:
I suspect the lack of 6 DOF is far less of a concern to cockpit builder - I’m actually only planning to use one axis of mine with my own pit, eventually…to provide up-look. Other than that I want a visual system that will make me move my head as close to naturally as I can achieve. MMV for desk pilots.
All this stuff is good…er…input…!
There is a software solution for 6DOF using EDTracker. I run FaceTrackNoIR as my tracker and it can use two tracking sources. I use EDTracker as my first source for pitch and yaw (roll), and I have assigned my Logitech Webcam (cheap Logitech C615) to track my face for X, Y, Z motion as a second source. This works well so I don’t even need to do that simulated 6DOF stuff.