Well it fairly simple but you want to make sure you make copies of the files that you'll be changing.
There are two ways of doing it. In the map editor go to files>build>global settings scroll down and you'll see the health ammo lives etc Huds. Just clear the fields you don't want.
The second way is to delete them from the setup level.fpi. Go to files>languagebank>English>gamecore>my game>setup level find the lines that define the HUDs you don't want and delete them. Save the edited file and your done. However I'd don't suggest doing this without creating a copy of the original.
Learn scripting it is fairly simple with just the basics of how it works to make Huds do and look the way you want.
Like you I didn't like the health HUD so I created my own. I posted it here
http://http://forum.thegamecreators.com/?m=forum_view&t=201502&b=24
The script isn't that complicated in fact it's pretty basic, my point is it wouldn't take much to get what your looking for download the file and look at the script.
The first few lines define the 8 Huds I used. Each one showing a different amount of damage
The next few lines tell the engine. When the damage is between this amount and that amount show this HUD.
When the damage gets to this amount remove the old HUD and replace it with the new one.. And so on until the player is dead..
Good luck!
