You will find that there are several things that IV left in the game from pre-release versions, but which are now non-functional. There are commands, units, buildings, and other stuff which just do not work correctly. One of these features is multiplayer. The blue team was at one time the client team for multiplayer matches. Since multiplayer does not work, at least to the extent where it is in any way playable, the blue team is no longer useable.
Basically, if it hasnt been already covered in any of the mod sites, forums, or any of the existing 'supermods', its very likely that it cannot be done. But you can still make an original and worthwhile mod! Concentrate on the storyline and the gameplay and make interesting maps and complex scripts. Personalize your mod with new models, sprites/textures and sounds/music.