In the Ghia book by Valerio Moretti there is stated the following:
In Chapter 9. The “B. Junior”
1954- Alfa Romeo 1900C. The first of the Bjunior by Gian Paolo Boano was a fairly traditional coupe in line with contemporary Ghia production
In Chapter 27. Giovanni Savuzzi
1954 - 1900SS. This coupe designed by Savonuzzi was exhibited at the 41st Paris Motor Show and bought by a French industrialist, the ‘king’ of the zip fasteners

He stated further: “…on the chassis of the Alfa Romeo 1900 SuperSprint, e.g. the twin tone Abarth-Alfa Romeo 2000, Prepared by Conrero and presented at the XXXVI Turin Motor Show and then Paris in 1954.”
It is clearly that design wise, both cars are almost identical, so they must be designed by the same person, but who is the creator Gian Paolo Boano or Giovanni Savonuzzi?
And what were the exact responsibilities of Alfa Romeo, Ghia, Abarth and Conrero in the Abarth-Alfa Romeo 2000 project? (the author mentions that the car is based on an Alfa Romeo chassis and not an Abarth chassis)