I saw one of these at a light yesterday.
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I'm really not sure about this. I mean, I get the attraction of retro builds. And the Challenger, from the factory, certainly has a lot of styling cues from the old muscle car era. And I have seen people turn a Camaro into a modern take on the TransAm with great success. And it makes sense, since the two were sister cars.
I just don't think this really works. The Challenger and Roadrunner basically share no styling, and the result just looks awkward. The proportions just aren't right.
Maybe it would work better with a Charger as the base, although the whole 4-door charger thing also seems odd.