I do not know if many are/were aware of in the late 1980's of the FASA RPG of Star Trek.
It was considered "canon" until TNG appeared and well blew it all apart. That and some legal threats.
Well, this is a pic of some of those exotic "kitbashes" that were drawn up in their 'tech manuals', particularly the Chandley Class Frigate (A sort of commando carrying cruiser) and Larson Class Destroyers.
Here the ship is struck by a D7 with devastating effect, whilst its Larson escorts engage other Klingon ships - with devastating effect.