How about one with a very thin single crease line between the headlights seperating the bonnet (hood) from the lower bumper. The lower bumper could have a moveable panel as you have it but with very thin slats. The panel behind could have a conventional grill also in the body colour.
Not sure what you mean by this.
Also, who's saying we can't move the radiator around?
Here's a sketch I did a few weeks ago but didn't scan until now.
Quick Crappy Rendering by
Tyler Linner, on Flickr
Project is seriously on hold.