I manage to port (most) the classic Doom 3 mod on Doom 3 BFG edition. All the maps are working (exept intro) on both singleplayer and multiplayer. I heavily recommend to use Classic RBDoom3BFG since it is the only Doom 3 BFG Edition source port that support .ogg and .flac audio files and you can start the singleplayer campaign by using the new game option. Download Link.
