3d hud

Hey, this is probably on the wrong section but since this can be done without GUI I didn't know where I should put this, anyway, can someone guide me on how to make a 3d hud like in cryengine or this game? https://www.youtube.com/watch?v=pwkluNjPXLI&list=UUOJKLOVRNKdweGETEl30adw I know that I could use 3d planes to get that effect, the thing is, how would I make it always fit the screen, I could put it close to the center so it wouldn't get out of screen, but at the same time it would be extremely lame for someone with a wide screen. So I guess this sums up to one question, how can I make a set the objects always fit the screen?

I thought about using a parent object that would scale in and out on the x axis, but that would probably make it extremely stretched out at wider screens, so, any tips?

 

Calculate the position of your planes depending on screen size..

http://docs.unity3d.com/Documentation/ScriptReference/Screen.html

 

I guess I'll have to try something like that then