Not exactly easy. First, you have to also add a secondary firepoint and appropriate table entry, since ATM... FSO won't accept a ship without secondaries. Just give the bank an allowed of and 0 cappacity. Secondly, both myself and others who have attempted this, have run into an odd problem... when attempting to fire the main beam, all you see is the beamglow, but no beam. Others have reported that the impact effect and dammage is still visible, but my efforts have not yielded the same result. Also, for some reason, n'either MODview n'or PCS will allow you to move the eyepoint to where the bridge is. By default, it places it directly between the forward cannon pair. Couple that with the old bug that will not count beam kills to the player. If you're flying a Nial and you take out any ships with your beams, you won't get credit for it.
While I'm posting (and as this seems like the right thread to ask this in), I was thinking back to some of the Narn ships and one question popped into my mind. If you've ever seen "Walkabout", you may remember that during a meal with G'Kar (after discussing the Sweedish Meat-Ball paradox), War Leader Na'Kal gives a list of the various Narn ships that have been recovered, rescued, and repaired. He mentions Heavy cruisers, medium warships, one other I can't remember, but he also says "Dreadnaughts". Now, is this a class of Narn ship we've seen before or not? Would this be bigger than a G'Quan class, or merely an antiquated class designation for some of the older ships in service? If the general consensus is that this is a not-yet-seen design, would the TBP team be open to finding a suitable fan or non-canon design for the class?