Majeh, the problem with that is, if you look at the actual model used in the films, where are they?
Imperator-I has three medium triple turrets on the centreline forward of the superstructure, and four large twin turrets on each side of the superstructure. The after of each heavy turret line is supposed to be an ion cannon, and light turbolasers and point defence cannon are spaced mainly along the brim trench, along with possibly two quad mediums each side.
Imperator-II deletes the triples and replaces the heavy twin turrets with eight octuple medium-heavy turbolaser turrets, and reduces the trench armament to light and PD weapons.
The 60/60 line is descended from West End Games, and they don't seem to have actually looked at the model when statting the things up. This is the Star Wars equivalent of B5's Lasers-on-the-Primus, Centauri Ion Cannon grumble, except it's been running for twice as long.
Similarly, there's an unsolved problem about the troop complement; specifically, there may be room on board, but unless they flatpack, how do you get an AT-AT landing barge to fit through what we see as hangar doors?
There is one reason to put up with WEG's stats; how they scale, or not, to the real world. Basically, the system allowed heroes, etc, to take combined actions, pooling their effort, and get bonuses for it. It was possible to do this with weapon damage, as well, in fact it was necessary with a 20- gun battery. This is how wings of starfighters were supposed to hurt capital ships. Let the big ships play by the same rules, and you find an Imperator-II's forward guns throwing the equivalent of 5D Death Star scale. That's a mass extinction on an Earthlike planet, a hard kill on something the size of Luna, Mercury or Titan. Somehow I think they might have got the scaling wrong a bit there.