When you think about renzu line you must keep in mind the following statments that will help you to design them, or understand how they must look like. What we have in game, all vanilla ships, are mostly produced by and for military with having military porpose in mind.
When you look at renzu - it is a civilian, yes huge,, yes, actually, transnationaly, but still, civilian company that design the ships for use by those who want to go around the dangerous environment of open space with style, who got enough money to buy a ship.
Example.
This is how stuff for military look like:
This is how stuff look like when it is made for commerce
I think you got the main idea I'm trying to bring.
Not Kusarish, it is made for any customer possible siriuswide, It must be stylish, makes millionairs want to buy one to park on their private lunch pads.