@Korbi:
As far as it goes for HMCS, you would need to disable it from rendering in the screen-projection, build a HMCS-replika with a real projector onto a visor and then you have to hope for a alignment feature develepod by BMS.
That is overthinking it, no need to get extra helmet projector, movement of the HMD on the screen if unlocked can be properly scaled on any background with the curves in TrackIR in both X-Y axis. Yes I will probably never have a big space to look UP, but better than nothing. In regards to visuals Having the HMD itself flying over the projector screen is good enough, the primary HUD will be this way anyway in most pits anyway and even on the picture I posted the HUD is part of the main projector, the one in the physical pit is a fake or mirror. Practically the only thing I want is making the HMD symbols to be a cursor-like thing flying around the screen and locking targets (literally like playing RTS and clicking on something locks it, just controlled by the fake TrackIR analog inputs).
PS/EDIT: With all those simpit guys out there, I wonder why I do not see much about this problem, or are all those giant beamer simpit setups out there changing camera angles with TrackIR as a normal small monitor just to get HMD working and accept killing the immersion? From a programming perspective should be simple enough if allowed access to the engine code, somewhere there needs to be camera and HMD angles tied together, and just decoupling it and experiment. Pity FreeFalcon didn’t survived, right now I would be deep in the public code trying to find this, with BMS don’t know where to begin.