They follow their military counterparts. The complications arising from increased size are significant enough that you can't just scale up the basic designs and expect to get something that works very well.How does research into ship hulls work in regards to civilian vessels?
Ie, can we automatically build freighters, shuttles, passenger ships, surveyors, etc. pp. regardless of their size? Or do we unlock them via hull-research? Ie, researching Frigate means we can build ships <200m or so in length, Light Cruisers up to, say 400m, Cruiser up to 700, etc?