The less 'freelancerish' ships out there that have been made for the mod itself are actually for factions that have no, or little, basis in Vanilla FL and so have no past design influences.
For instance, the Coalition.
They had no typical design influence before they were created..since they didn't exist.
The Mollys have flown the 'pirate' line of ships for almost a century now and they are fine shipwrights in their own right.
If you are working with a Vanilla faction or a faction based on something in Disco, you'll need to look at their typical design type first. Expansion of it is what works for them.