Ok i just made a big mistake when i was making it in game ready. I don't know why but what you just were working on doesn't work instead this is what it should look like after you finish it in gimp.
You just have to make a black box in the middle of the screen and the area that's transparent in gimp turns white ingame and the area that is black turns transparent. Dont ask me how this works it just does.
So after you do that copy and past you JPG image into
files/gamecore/huds
and anywhere else from there.
Next go into FPSC goto build game then global script.
Now go to where it says ammo under hud the replace that with your image.
your good to go, again sorry for the mess up

. If i haven't been clear i can post some pictures later.