One question, though: the Leviathan is bigger, are you sure this won't break anything?
Even from an aesthetics/lore standpoint, having leviathans equally sized as fenrises suggests that the former really is a retrofit, where they took a fenris and slapped some mods on it. If the models are completely different sizes, the tech description stops making sense.
"After the Vasudans began making incursions into GTA space, command decided that it needed a new defensive cruiser. Changes to the Fenris led to the GTC Leviathan line of cruisers, produced as mobile defense battleships. Their speed and maneuverability were greatly reduced in tradeoff for more powerful weapons and a stronger hull. Production was discontinued when the GTA thought they would win the Vasudan war after the Battle of Gulnara, and then the production was started up again after the defeat at the Talania system. Because of the on-again off-again nature of this vessel's production, almost all of the Leviathan Cruisers have different armaments, but all have consistent hulls and speeds."
"Early in the Great War, Han-Ronald engineers designed and built the Leviathan class of cruisers. The Leviathan is much heavier armed and armored than the Fenris, but also much slower and less maneuverable. Leviathan cruisers are used to guard critical installations, such as permanent jump nodes, deep-space factories, and gas-mining operations, where firepower is king and speed is of little importance. They're also well-suited to escorting slow-moving freighters or transports. The Fenris is good for fast-moving operations, but when you need some muscle, call in a Leviathan."
Neither game's tech description says retrofit or even suggests it. They sound more like they looked at the Fenris, went "Hm, we need some changes" and thus was born the Leviathan. Plus, you don't just stuff armor plating and a few guns on a ship and give it a new designation entirely (nor is that feasible if the internal volume is as well utilized in the Fenris as it probably ought to be). The idea is, to fit what the fit into the Fenris, they had to optimize some internal space and generally take structure shortcuts. The Leviathan, however, needed expanded volume to fit in the fluff's "more powerful weapons" (which likely would need stronger powersupply(s), but more internal volume mainly, as well as storage if they were kinetic-based). Plus, bits of the Leviathan are more angled, which means bits of internal volume that gets displaced by that needs to be moved elsewhere (the whole angled bit is more a callback to early tank design).
In general, the idea sort of paralleled the way the IS-4 upgrade to the IS-2 played out: The IS-4 was meant to be an upgrade based off of the IS-2 chassis that increased armor.
^ IS-2
^IS-4
So, while the IS-4 is similar, it's larger, and has some glaring differences as well.
That's just one example. There's plenty of other examples of things radically changing when trying to upgrade or 'change' something due to engineering or design constraints in aviation and the navy.
That doesn't necessarily mean I won't change it though, I'm entirely open to debate.
