i have a picture and a nice article about that car but has nothing to do with the puzzle car. It was built in 1984 and it's basically a Fiat Uno with raised top and a fancy painting (talking about the exterior).
Here's an automatic translation:
FROM THE FUTURE ARRIVES 'RAINBOW' THE VEHICLE POWERED A METANO
BOLOGNA - The future of 'automotive industry' is also a powered only methane car. It's called "Rainbow" and the design of a prototype was shown yesterday by 'engineer Adolfo Melchionda who with his collaborators is building the machine to present it in September, on the occasion of "Metanauto", the conference on' use of natural gas in transport . The prototype uses the body and, where possible, the mechanical parts of the "Fiat Uno". The engine of 1,300 cubic centimeters will be high performance, obtained with the 'adoption of a "turbo" system moved by electric current supply directly from the normal alternator. The gas cylinders will be placed under the floor of the vehicle to provide greater stability. It will be built fiber d 'steel, lower than normal weight and should provide a' range of at least 250 kilometers. L ' "Rainbow" can be converted into taxis, van and ambulance.