One option might be to have a secondary hull directly underneath an Arrowhead primary hull, and using some sort of fairing on each side of the secondary hull to mount photonic torpedo launchers. While this would compromise ventral-aft firepower, that could be compensated for with enough maneuverability + adding one or two aft phase cannons on the back of the secondary hull.
Nacelles could either be slung underneath the primary hull, extending out from the secondary hull/fairings, or attached above the primary hull with short struts.