There are a few mods I would like to do with the hud. 1st I want to start with moding the compass to show X relative to the player as well as distance and strength.

Compass Lay Out:
Make the pip half the current height and add strength indicator to the bottom of pip. New pip will move on the X axis 5 pixels per every 10 degrees (+/- 45 pixels) with the center of the compass being 0 relative to the player.

Strength Indicator Equation:
(npc.hp/(npc.damage/sec)/(player.hp/(player.damage/sec)
or
(npc.hp/player.hp)


Strength Indicator:
<.25 open circle
.25 to .5 half filled circle
.5 to .75 filled circle
.75 to 1.25 open square
1.25 to 1.75 filled square
1.75 to 2.5 filled square with a 2 inside
3.5 to 4.5 filled square with a 3 inside
4.5 to 5.5 ect .....


I would also like to fade the top part of the pip based on the distance the NPC is from the Palyer


Any help would be grateful
I have G.E.C.K.S. but see nothing related to the compass except a compass help message. Is there another program that would be able to do this of is it embedded in to the game engine and not modable in this way.

I believe the HUD elements are all done in XML (Fallout 3\data\menus) so all you need is a text editor. Examining mods which alter the HUD should help you eg. DarnUI, even Oblivion mods if you have that game. Good luck!