I uploaded an immersive-style UI that hides many elements, and I realized that instead of making 20 different versions for people who want things slightly tweaked a certain way, I should probably make a little write-up that explains what I changed and where it can be found, so people can make those tweaks themselves.

GO TO "ARTICLES" AND READ IT THERE, IT'S MUCH EASIER TO READ BECAUSE IT'S COLOR CODED!

Here's what I've been able to figure out how to "hide" (I'm actually just translating it way off of the visible screen) in HUDMenu.swf:
-Remove "AP" and "HP"
-Remove flashlight
-Remove enemy compass markers
-Remove button hint bar and remove brackets for containers
-Remove crosshair and animations
-Remove explosive indicator
-Remove directional hit indicator
-Remove hit indicator
-Remove button hint bar for objects
-Remove stealth meter
-Remove enemy health meter