I like to think Crossfields might be as varied as Connies have been shown. That triangular secondary hulled ship in the boneyard in TNG could be one, or the one in Earth Spacedock in ST3 (perhaps that IS the Crossfield)I really don't understand why 'Glenn' was just no called 'Crossfield.' They obviously intended to only have these two ships of this class in their story, and certainly they know how the naming conventions is Trek work. Besides '1030' would have been a sensible neat number for the first ship of the class.