On a unibody car, every panel helps support the whole. But if the car was caged, with forward tubes that will tie into the A-pillars, shock mounts, & rails, you've accomplished most of that. For twist I think tying R/F & L/F together (mimic the rad supt) makes sense.
Aero-wise, the air that gets through the grille & radiator and under the nose and into the wheelwells all creates drag; significant on a road-course car, critical on a top speed (Bonneville) car.