There seems to be hundreds of ships available, from all the big factions, and even ones that only exist in STO.

Do niche ships like the Tarellian ship from TNG: "Haven" exist ingame? I checked the wiki and did not find evidence, suggesting it is not ingame. It is my favourite Trek ship and I am hoping for a miracle. Maybe its missing from the wiki, maybe there is a custom ship designer that could be used to make something like it, etc.