Both Narn and Centauri stations are WIP. Narn defense platform is finished but nobody has yet begun working on Centauri blockade mine, same with any other cargo pods except EA. Actually there is just one cargo pod done at the moment but these are pretty easy to make, it's more of matter of time if these gets done anytime soon.
I am afraid only new Narn or Centauri ship that gets done to R3.0 is Narn defense platform (or was it in R2?), Primus and maybe Scarab.
Presumably R3.1 will bring you Octurion, T'Loth, Rutarian, Gorith, Toreth and both Centauri and Narn stations.