A body louvers

I have considered some type of hem or crease or crimp or something to stiffen it up. In fact, I am still looking at that as a possibility. I have someone who knows metal forming better than me, that is filling me in on options.
As far as the filler panel goes, you are the second person to say you like the idea. So, when I get a chance, I will get some pics of the louvers installed with a filler. (I have one made already.) I might be able to make the filler panel an option, so those who like it can have it, and those who don't like it won't have to have it.

Rob