You are correct, after looking at the wheels, same as the Elise GT and different rearend,
It was far more than a set of wheels and rear end conversion with almost everything apart from the Exige's tub changed.
I asked about buying the body panels for my car, but RTN who did the bodywork told me that the design was owned by Lotus and apart from that they would not have fitted because the "special" was 350mm longer and 100mm wider.
Its amusing that the people voting for the Hennessy are basing the judgment on the wrong car! :-)
And the guy who had the special built could have specified any powertrain he wanted as money was no object. But just sticking a more powerful engine in a car may make it faster in a straight line, but this was built for the track. Americans have never quite grasped the concept of going round corners until recently :-) And I base that comment on having owned several Corvette's since 1982.