For Gadu Boyz excellent Alfa Romeo TZ2 mod.
Some cars are very obscure, hard to find online. From documentation to photographs - this car is both. Until today; when I found a set of photos of the car in an Austrian motor sports photo archive.
Ottorino Volonterio was a lawyer from the Italian speaking part of Switzerland, who, according to HistoricRacing "rarely troubled the score sheets. With a pace that varied between slow and very slow his career was spent at a leisurely pace." The entire article on him reads quite well, so I recommend giving it a read:
Ottorino Volonterio biography
In the 1966 Zeltweg 500km, Volonterio didn't start the race itself, likely due to his sheer lack of forward momentum.