There was a German kit builder that I saw on a trade show, it was quite larger than 1/4 scale and was an awesome kit, they were entering into the market about four years ago, I have not heard of them since.
I built a Carl Goldberg Ultimate Kit a few years a go and covered just like the challenger, it is a show stopping.

I had built it with smoke but I changed the engine for best performance and I haven't found the time to assemble the pump with the new engine.

http://www.youtube.com/watch?v=GJF4f8E3bbQ

Note that the last picture in this slide show is the real challenger.

Best regards.