Thank you for your advice, unfortunately when I switched to my smaller tires it dropped the car back down 3/4”, and it would be too tight to still fit a 2+” opening and a radiused lip in within the remaining area without impacting my approach angles and ground clearance.
I updated my drawing, with my new plan of having my radiator intake at the very bottom of the grill opening, probably about 2.5-3” tall and 25” wide, so I will be close to the 1/6 “ideal” ratio. I picked up a flexible silicone baking mat, to actually form the seal between the front end “duct” and the radiator. I am still planning on using coroplast to make the duct, but I may reuse my aluminum front belly pan piece for the bottom, since I already have it made. (It is nowhere near exhaust….)
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