after watching this video, I slowly move towards the modification of this headset.
I have plans to:
change the housing with GearVr - because as for me the current headset is terribly small and uncomfortable, and it will give me more space for additional solutions and also can be used to calibrate the distance of the screen also maybe increase FOV.
integration of the Astro A50 - because the lack of a microphone and the current sound quality do not satisfy me
add full head tracking which Pimax4k does not have
maybe add a small USB hub to be able to implement leapmotion in the future (luck of founds).
try to improve the quality by replacing HDMI and even maybe replacing it with DisplayPort (big maybe).
The last one is very intriguing but I also know that it requires a more professional hand. I do suspect that there are some simple solutions. As they say, easiest way is always hard to notice.
As you can see that there are a lot of potential improvements, ideas. Currently I am afraid only on losing the warranty. But if I will start assembling it, I will try to record everything so that some interested, those who are willing to see, know how it went.