Heavily based on and inspired by the 'Realism Mod' made by HogRampage back in the days, Tomikaze and me came up with a recreation of this awesome mod. map file you can add this mod ( yes some changes in radiant are needed, so unfortunately this mod will not work on the stock WaW zombie-maps! ).
You can create a new map, of apply it to an existing map. There's a ton of other features included as well though, like a PanzerSoldat, JuggerNauts, Nova Crawlers, Special zombies and Supply Drops/Care Packages for example! The Realism Mod adds rpg-like elements to your much loved zombie-mode, leveling up your character and weapons to earn new abilities and attachments are the core of this mod. NOTE: The Realism Mod requires T4M !!! ( if you dont add all 'feature-packs' you may not need it.