Version 1.0 of lower grill block...
I wanted to have it come out a little so there wasn't such a deep pocket, so I used 2" XPS and carved it out into place, then ziptied it in. Then, made coroplast fronts to screw in.
I gave the coroplast a nice duct-tape veneer job and screwed it on.
Cover the screws...
And finally, a license plate holder!
It's about the same size of opening on the lower grill as my Neon and, as long as I was driving as efficient as I could, not even summer heat was enough to over heat the Neon! So, I think this will be alright... though, I don't have AC in the Neon, so I'm curious how well it'll do on this beast.