[buckyball]

Thanks for all of the input so far.

Here's a first pass at the suggestion "elhigh" made to close the openings in the bumper.

Good ole double-corrugated cardboard and clear strapping tape. I covered all of the cardboard exterior with tape after I took the pics, in case we get more rain.

I did not attempt to completely close the opening around the tow hooks. Somebody let me know if that's real important at this stage or not.

A final implementation would need to allow the fog lights (either side of the center opening) to shine through. Perhaps acrylic or polycarbonate...

Also, there is an inlet below the bumper (hard to see w/o my highlight) which appears to flow air past the tranny cooler mounted near the lower edge of the main radiator.

Also, a close-up of the grille. There is not much behind the vertical opening, so I probably close both (L & R) of them. Closing the horizontal openings will require more experimentation to avoid overheating things.