Just tested the mod and I love the idea! A great DooM HUD is always appreciated! thank you!
Can I make a few suggestions?
If the emphasis is on readability and keeping the information in the periphery, why not swap armor and health? Keep the least important information at the edges of the screen, and possibly make health slightly larger than armor.
Have the current ammo pool float to the top? Or place the ammo counts at the bottom of the screen (similar to Quake) with the current pool centred and in large font (similar to how Doom 3 places the ammo counter on the weapons).
Take a look at these cutom Quake Live huds. http://qlhud.net/author/R1per2
Is there a source code for this mod so we can make our own changes?