I don't even know if they ever actually had a running bike. There are mock-up pics somewhere on this site of what they had designed, but the backgrounds were heavily Photoshopped. They also had a website, but that apparently is gone.
Rocket Drag Sport was some firm or person over in Europe, early on in Rocket history, who had designed a body kit to turn the Rocket into what is basically a large muscle tourer.. similar to the current Trophy 1200, but with the muscle of the Rocket. It was a pretty neat looking concept, I just don't think it ever got off the ground