The car is called the ChallengeR by Michalak. This conversion was done in 95, and the intent was to start up a race series using this version of the Viper. Here is what the press release says:
The prototype of the CHALLENGER is a sturdy intended to sound out the level of interest in a modified Chrysler while at the same time demonstrating to the industry the Michalak Studio's high standard of design and prototype construction. This is why it is meant to be convincing on the merits of its sensible concept in the highest possible quality rather than merely as a showpiece.
-it has no roof at all
-it's cockpit and windshield have been designed with the driver in mind
-the passenger's side can be closed with a sturdy cover against strong turbulence in the interior of the vehicle
-strong roll bars and fourpoint seat belts ensure safety
-the motor and the brakes are provided with additional ventilation.
it can also be converted back into its original condition at any time.