I've been messing around a bit with the hudmenu.swf but so far I've not managed to make any changes to just about anything(HP / Flashlight icon / AP-bar etc). I'm basically just trying to get anything to change to figure out how it works but I've run into a dead end here and I'm at a loss of how to proceed. Placing the modified hudmenu.swf in the interface folder in /data/ doesn't seem to do much, and adding the INTERFACE extension in the .ini file as many modders seem to have done hasn't changed a thing either.

To give a better idea of what I'm trying to accomplish:
I want to change out a few things.

HP: Remove the HP-bar and replace it with a Health Icon (Heart / Human heart / Plus-symbol) that indicates your health-status with a colour(Red/Orange/Yellow/Green) instead of giving you a precise indication of how much health you've got. (Still visible in the Power Armor.)

Radiation: Like HP - but instead with a Rad-icon. HP will only heal up to the colour that the Rad-icon is - or perhaps display a status text with a colour. (Still visible in the Power Armor.)

Ammo: Remove the Total-ammo that you've got and only display the current ammo in the magazine/clip. Probably not something for everyone but I like it. (Still visible in the Power Armor.)

Enemy HP Bar: Replaced with a status text, like in previous Fallouts(1 and 2 I believe). "Injured", "Near Death" and so on instead of showing their HP.

I'm essentially just trying to up the difficulty without altering gameplay per se. I'm not asking for someone to do this for me but I'm just not sure if it's even possible yet? I've read something that certain files or whatever are protected for now. It's possible to change the cursor and such but would it be possible to make changes to these things I'm wanting to alter(right now)?