Risen 3: Titan Lords

[Kreekakon]

I think the best solution for all the HUD immersion breaking problems is adding a hot key that turns on/off the HUD visibility, there's a mod for Skyrim that does that and works like a baws. Allthough the thing you did with Risen HUD doesn't look too bad imho.

Or you could do it like Dishonored did for example. That game had a setting which allowed to HUD to disappear when it was not "being used" and only re-pop up when it was relevant.