I don't think the airflow issue is going to be any worse than mounting lights/winch right in front of the grille. I like the look of the lights behind the grille, but it takes away a bit of the light output. As far as in the grille I would like to see the mock up with lights in front of the Jeep grille. I am not a big fan of the Jeep image, but it is not my Jeep. If you like the way it looks, go for but post up pics when you are done it may look better once it is all together. This setup also kind of reminds me of the Mustangs.

Also, what color is the grille going to be? I don't know what color your Jeep is. If it is black.. the image of the Cherokee won't show up very well.