So I downloaded your HUD and tried it. Nice work! It's a little thing, but it's nice to have Kills, Items and Secrets right there on the HUD instead of having to go to the automap all the time. The Standard Grey wasn't doing it for me, so I went about adapting it to the custom HUD I use. When I finished all my editing, I found some problems. Jaxxoon mentioned two; it conflicts with any wad that uses a custom HUD (most likely megawads and big projects), and the Red Card/Skull Key error.
Doom only uses the last SBARINFO found, so I think you just have to make sure your HUD is loaded last. You should probably include STARMS and all the number/percent graphics in the wad to make it as self-contained as possible.
The Red Key error was minor. You defined the keyslot as '4 && 7' instead of '1 && 4'.
The other issues took a little longer to address. One of the first maps I played was a slaughtermap with 1500 monsters. Your HUD maxes out at 999. I re-edited my HUD to allow for four numbers in the Kills fields so it wouldn't over-write the divider graphic and changed the 3 to a 4 in the SBARINFO. In doing that I realized the Ammo fields in Doom were originally set up with enough space to allow for four numbers, too. Don't know if id was originally thinking of thousands of rounds of ammo or what.
I had just watched "To Hell and Back", the Audie Murphy story, where at the end he jumps on a burning tank and uses the tank's machine gun to shoot down dozens and dozens of German soldiers (obviously, the machine gun was set for Infinite Ammo). I like the image of mowing down an army of charging Demons with bullets until your Chaingun melts, so I upped the maximum standard allowable ammo to 9999 (just changed 3's to 4's) for mod makers who want to go that high. I also stretched the Ammo field to make room for 4 numbers.
The other issue was centering. Your additions are on the right side of the HUD and make it off-center. Anyone using it in 4:3 video mode (800 x 600) or 5:4 video mode (1280 x 1024) would have the HUD cut off on the right but have an open space on the left side of the HUD. So I moved everything over to the left. The mugshot is no longer centered, but the HUD now fits perfectly on-screen at 800x600 on my monitor. I didn't test the STBARZ. I hope I got that one right, too. I'm guessing the HUD entry in the wad is a compiled version of the SBARINFO, but I don't recognize it or what port it's for, so I didn't touch it.
I've included my edited HUD and graphics (the originals of which I did not create; I just don't remember the wad I grabbed them from 10 years ago) and the edited SBARINFO.
Thank you for doing this.
Edit: I just realized I probably shouldn't have attached the file here. Here is the same file at Mediafire.
SbarPlusPlusPlus.zip
http://www.mediafire.com/download/37cd7 ... usPlus.zip
Edit2: There's actually one more minor issue, but I'm not sure it's fixable without some scripting. In Deathmatch, when you pick up re-spawned items, it adds to your HUD total Items found, but not to the total Items available, so eventually you'll have like 35 items found out of 9 possible. Fixing that would require adding the same code used by the Icon of Sin when it spawns monsters or an AV when it resurrects, I think.