I've started this project a very long time ago, alongside Christian S. Zoric (CED2011). We planned to work on remaking the whole original DOOM under this engine, in a similar way Classic Doom 3 mod did. At some point in the past we've also had a team and some private forums, but all went down slowly.
We decided to start out with E2: The Shores of Hell since E1: Knee-Deep in The Dead is already done by other team. The mod was considered dead for some time, but now I'm trying to revive it, gather a new team and finish it.
Not much progress is done at this point. In the mapping part, there are only a couple of maps done and a few WIP (from Episode 2). As for the monster models, all the monster models besides the Zombieman, Cyberdemon and Spider Mastermind are done. With 3 of them fully animated. As for the weapons, the Pistol and The Shotgun are done and roughly implemented in the game. But I have plans to have them remade because just it doesn't seem right to use a classic 2000s Beretta and Remington in a future game. They are still planned to have that classic look.
As the description tells, it aims to re-create the whole original DOOM like it was being made with today's technology. The story, levels, monsters and weapons to be remade adding a more realistic touch, but the gameplay mechanics to be similar to the old DOOM.
The name Codename: DOOM comes from from DOOM 64's manual: "The military episodes code named "DOOM" were not actually completed."