the basic design overview for ships is actually very noticeable
lowtech ships have this in common: are all old, have a similar armour setup that favours orange armour "plates" and semicircular designs (i guess to deflect bullets? no idea, but the front of all ships, even the onslaught to a degree, follow an oval form)
midline ships look much more like your classic "starship": triangular designs with metal-ish beige plating. the most important part of this design is that contrasted with low tech ships, which are bsically giant armours with guns, these are observably modular. specially noticeable with the designs of the sunder and hammerhead, eagle and falcon, and the carrier cruiser. in short: midline ships are easily improvised through modular design.
hi tech ships seem to be very unmodular - there's no really visible "plating" like midlines and lowtechs have, so it's safe to assume they are built from a single pieces or something, furthermore they have lots techie anthenas (the astral is specially guilty of this), and they are have "function specific" designs that often tend to be assymetrical
ultimately, the only real design differences between ships are this:
1. hegemony "mainstay" fleets: low tech and midlines that follow certain plated design and colour aesthetics
2. high tech fleets that follow non-modular design and function dependent assimetry, often designedby tri tach.
3. Outliers (oil ships and lore specifics ships like the kites, shuttles and starliners - designed by companies not mentioned elsewhere with very old pre hyperdrive designs or simply non military applications, that look designed for that specific purpose or actually meant to look "sellable" like the kite and the starliners
Neutrino easily looks like midline designs with their modular looks (and a couple grand in paint jobs), while SY looks high tech with clearly specialized designs and even more money on paintjobs