Symmetry?
The AC condenser needs love, too?
I may almost never use it, but you had better believe I do when I have passengers! I always figured this needed far more work. I have looked for square ABS pipe to reinforce and put around the inlet, and then go off that to duct into the grill, but I did not find anything. I have planned on taking the rest of the plastic and cementing it to the back for rigidity, but on days like those, I just cannot get out of bed.
Recently, Aerohead told me I need to bell-mouth the opening. I looked at 3" ABS pipe at the hardware store. I thought about making a frame with an equal opening, slit the sheeting, and cement it to the pipe, and then have a pipe run the width of the bumper, attached at the bottom, but I still do not think that would give it much rigidity (at the edge), and I wonder how well I can make 45° cuts in pipe, but also I had spent too much time outside on a 116° day.
Honestly, though, putting it right in front of the radiator makes a great deal of sense.