Tim,
I had the same idea about adding hood extractors a few years back but the hood almost complete and didn't want toad more time to the body guys prolonged completion date. I think that they really look good, flimsy or not.
When my car started body work I was trying to figure out how much hood clearance I needed. I did not think the "standard" six pack hood would clear. So my concept was to take the factory '68 Barracuda hood and raise the center using the upward curve of the area where the inserts mount but go up as much as needed and make the center look as much as possible like the '70 AAR hood. Then I wanted to add some deep heat extractors on each of the front sides, similar to GT40. About the same time I bought my wheels. A few months later the first pictures of the Hellcat emerged. Yikes! The hood would have been very similar, and the wheels - you be the judge! Thankfully I was able to squeeze the tunnel ram under the hood. It would have been awkward trying to explain to people that my hood ideas and wheel selection were BEFORE pictures of the Hellcat were released. People would have been skeptical and think I was trying to copy the look.