Ah, looks very nice Mike! As for the front C-west underside plate, that does infact help aerodynamics drastically by speeding up the air that flows under the car and making it escape out the back faster...one could call it a front diffuser actually. The ones that stick out of the front bumper are called canards or splitters. The smoother the underbody, the faster the air flows past it...the OEM splash gaurds are really to protect the underbody + aid in air flow but that is MOSTLY for aerodynamic purposes...if honda felt they needed a bigger plate to protect the underbody, it would've came with the car. If you ever see a Insight on the road, look under the car.
With cars we try to achieve the opposite effect of a airplane, we want the air on the bottom of the car to flow faster then above the car so we create a low pressure pocket underneath the car causing air from above to push down on the car and create downforce. Also the faster the air escapes and less obsticals it has to fight, the less overall drag there is on a car. Hence why race cars have crazy flat underbodies + sit SUPER low to the ground, it forces the majority of the air over the car.
I'm curious if that front plate could work if you had a OEM lip or another lip ELSE then the C-west one which it's supposed to work with. I'd love to have that front plate paired up with the First Molding rear diffuser.
A commonly overlooked area in tuning today is aerodynamics, you'd be surprised how much more stable/faster a car can be when the aerodynamics are tuned correctly.
Mike, is your dad going to let us rob the bank or what? LOL