Woody,
Out of curiosity on your design. Are the front of your vents in between the radiator and the fan belt so any water would not drip on the belts? Did you think about putting solid sides down the vents to channel any water to the front? I would think that while driving the water would not be much of an issue with the venturi effect, except maybe on the sides of the openings. When parked outside would be different. I really like the looks of your hood. Great work.

MikeR