I bought the game.
There are no hud options. You can't natively disable the hud.
However, there is a Devmode mod that will let you do it for Fear .
You can get it here: http://www.gamewatcher.com/mods/f-e-a-r-mod/dev-mode
It only works for Fear, not the expansions.
Can you figure out how to make it work with Extraction Point and Perseus Mandate?