Actually a vast shipline could be made of unificated components across the ships and classes, thus we could follow the idea of "lego" crafts, replacing FF and Crow now and adding LF, VHF, SHF, FR, and couple more transports.
Like we can see the line in airctafts - similar tail, tendency in wing position, engines, cockpits.
You can check Antonov AN-124 and AN-225.
The biggest cargo plane was barely made of 124's parts with additional engines and fuselage sections.
We can make the ships, which are made of similar components, while not making it too much obvious.
