You might be interested in my first hand experience with broad side turrets while developing CTC-C here, and one of my remarks on the experience;
@jacabyte, on 05 August 2009 - 06:39 PM, said in Broadsides:
I thought I had posted in here already? Oh well, I'll just have to post my experiences with broadside weapons from CTC-C again.
You see, the player could handle broadside weapons fine, but the AI would face the player and proceed to shoot fiery death out of its sides. It was promptly killed by the player, and AI ships with broadside weapons would never get anywhere before running out of ammo. So I removed the mention of the weapons from all player and AI ships and reduced the appearance rate of their outfits to 0%. They're still in CTC-C, but you need plug-ins in order to use them.
Now, keep in mind that these are projectiles weapons. I haven't experimented with side-firing/angle-firing missiles at all, come to think of it. I have toyed with the idea of making rear firing missiles, but I can't help but think they'd be too powerful in the hands of the right player.
So the primary issue is not that it can't be done within the confines of the Nova engine, it's that the AI is too stupid to know what to do with broadside weapons. If you can get the AI to handle broadside weapons correctly, more power to you.