Italian coachbuilder Castagna Milano has revealed an ambitious proposal to transform the Alfa Romeo Giulia Quadrifoglio into a bespoke two-seat convertible, complete with carbon-fibre bodywork, dramatic styling and its familiar twin-turbocharged V6 engine.
For now, the project exists only as digital renderings. Castagna Milano hopes to attract a dedicated Alfa Romeo enthusiast willing to commission the one-off creation, turning the performance saloon into an exclusive open-top grand tourer.
The proposed conversion goes considerably further than simply removing the Giulia’s roof. Castagna has redesigned the front end with distinctive Y-shaped air intakes, partially concealed headlights and aggressive daytime running lights. The result gives the Italian sports saloon an entirely different character.
Perhaps the most significant alteration involves the vehicle’s proportions. The front seats have been repositioned 330mm further back, creating space for an elongated bonnet that sits 40mm lower than the original. A prominent exposed carbon-fibre section runs through its centre.
Both the front and rear tracks would be widened to match those of the hardcore Giulia GTAm. Muscular wheelarches complement the broader stance, while a sculpted bodyline flows towards the rear, incorporating the taillights into the redesigned bodywork.
At the back, Castagna has incorporated an aerodynamic diffuser and active rear spoiler. The entire exterior would be constructed from carbon fibre, helping offset the additional structural requirements associated with converting a four-door saloon into a two-seat convertible.
Inside, the coachbuilder proposes a luxurious cabin featuring wood detailing and two different types of leather. Despite the substantial redesign, Castagna claims the car would retain an impressive 623 litres of luggage capacity, even with its folding fabric roof lowered.
Power would continue to come from Alfa Romeo’s 2.9-litre twin-turbocharged V6, preserving the mechanical character of the original Quadrifoglio. However, a longer final-drive ratio is planned to improve efficiency during extended motorway journeys.
Castagna Milano also claims the finished vehicle could weigh just 1,420kg. That would represent a particularly ambitious target for a coachbuilt convertible, although the figure remains theoretical until a completed example is produced and weighed.
Beyond the unusual design, the project represents Castagna’s desire to demonstrate the continuing relevance of independent coachbuilders. With manufacturers increasingly offering their own personalisation programmes, the Italian company believes specialist firms still have an important role in creating genuinely individual vehicles.
Whether the Giulia Quadrifoglio cabriolet ever reaches production will depend on finding a customer prepared to finance the transformation. No commissioning price or completion timetable has been announced.
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