Newel Xergis Prodono Battlecruiser Fold Capable, alien ship
ST-68 Space Transport Ship
Rivadavia class Battlecruiser FTL Capable
The reason given on the Borodino's page (via the link) explains the size discrepancy is due to required internal volume (340,000 cubic yards/259,948.7 cubic meters) to carry shuttles, fighters, exosuits, etc. The Battlecruisers of the Solar Empire were originally designed as Battlecarriers/Command Ships but were found to be inadequate against the Posse Commitatus/Newel Xergis and so were downgraded to Battlecruiser.
I made each fleet in Nexus Arcana unique, with their own stories of development and technological evolution. I did this to avoid "cookie-cutter"/generic space fleets like those found in most SF and Space Opera shows/stories.
I thought it best to wait until after I get the other models done.
I'm working on the Valkyrie right now and may have it done sometime this week.
The "mystery" ships will be done after that.
I really need to get better charts up and this is the first one of a whole series of improved ship charts I'm making.
That sounds good... and this kind of charts (kiiiinda more interactive with links) is something I should have done, aybe I can try something similar when I redo all my models.
Maybe you can take a look at other people's charts for inspiration?