I found this model of a slightly different Volvo P1800 a few days ago.
It seems that this scratchbuilt model reflects the design exercise by Italian designer Fissore.  You can find a b/w picture of this car on page 106 of the book 'Volvo 1800 - The complete story'.

The current owner of the model pretends that is was made with only this picture as a source of information.

The model seems to made of wood and measures 380x150x155 mm ( l x w x h ). The wheelbase is 220 mm and the tyres are made of rubber.

Does anybody know more about this model ?