1. Yes you are correct my mod has created a base station that is much larger than a super dreadnought.
2. Very true however for the purposes of style and function within that picture I decided to put a much tighter formation than one that would normally be seen in a battle fleet with the Icaran level of Technology.
3. I did this for that picture because it was quite a load on my computer to have that high a poly count.
4. You are again very correct the Icaran starships of Battlecruiser on up are inspired by WWII British and US capital ship designs.
I've never seen starblazer's
As far as the guns go, the Icaran Main batteries were estimated by a friend of mine to be about 150 meters long and almost as wide due to the fact that the SD is 3 kilometers long and the guns are so huge in comparison.
As far as internals go, the Main batteries each have a micro quantum reactor to provide energy to the I-Laser cannons which provide 2 terawatts of power in each shot. The turrets also house a 150 man gun crew which includes engineers, DC teams, targeting and sensor techs and gunners who actually fire the weapon.
This crew may seem excessive but this isn't star trek and the Icaran ships are just to large to have a single computer dictating the firing and targeting of every weapon on board as well as handling the myriad other essential systems, plus the crew allows for redundancy and immediate access to repair the turret should it take damage.
The secondary turrets (secondary are the smaller cannons laid braodside in the center of the hull) do not have a micro quantum reactor but instead carry fusion "charges" which are two shot "reactors" that provide a 500 megawatt power output per shot. These charges are loaded in similar fashion to the way a modern warship would load a shell however they are not ejected and dispensed they are instead removed and recharged off of the main reactors for re-use. These smaller turrets only have a crew of 75.
The point defense batteries are (frag) cannons (frag being short for fragmentation) which fire bursts of highly charged matter similar to Plasma. It's pretty much a solid shot weapon that uses auto-loaders to load the charge into the gun and fire it.
The crew of these turrets is only 18 men and women because they do not have the DC parties or engineers that the primary and secondary batteries have.