Hi the reason that the omegas guns are like that, is how they are on the show. The screen grabs I have from season 2 and 4 of B5 with the omega, that is how the main guns are. See attached image of the front guns from season 4.
As for the flak guns on the Nova i must have just missed those.
The other ship, the shadow battlecrab the model is causing the game to crash at random points, so I removed it. I thought I had deleted it from the table but after uploading I realised I hadn't.
I am also working on fixing the thunderbolt for docking points and pathing.