Ed,
By grills, I assume you mean some sort of rock guard for the front opening? I hope so, because my car almost swallowed a piece of an arm chair that had fallen out of a truck. I was lucky enough to miss it (not the Suburban behind me though) and drive on. But it got me thinking that just about anything would punch a serious hole in the radiator.
So, I hope you will work on this soon. If it is anything like your heat shield, I will be in line to buy one! Also, please consider the lower opening for
oil coolers. It needs protection as well.
Skip B