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Aston Martin has unveiled its most extreme roadster ever. The one-off Vantage GT12 Roadster is a tailor-made customer commission undertaken by Q by Aston Martin, Gaydon’s bespoke personalisation and customisation service.

Conceived and delivered within a nine-month period, this mean-looking machine is based on the Vantage GT12 Coupe, combining the hardcore ethos of the donor car with the open-top element.

The most visible differences are the significant number of new carbon-fibre body panels, while beneath the skin is a unique suspension set-up helping to ensure the Vantage GT12 Roadster shares the same handling characteristics as the 100-unit limited edition coupe. Bespoke paint and trim, too.

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Under the hood is a special 600 PS version of the brand’s 6.0-litre normally aspirated V12 engine mated to a seven-speed Sportshift III paddle-shift transmission. Technical highlights include magnesium inlet manifolds with revised geometry, a lightweight magnesium torque tube and a full titanium exhaust system.

AM says that the Vantage GT12 Roadster is a significant landmark, as this is the first time a customer has been able to call upon the full scope of the company’s design and engineering capabilities as part of the Q by Aston Martin service. Initially offered as a means of providing personalised colour and trim combos, Q has been continually expanded.

With the incorporation of Aston Martin Advanced Operations – the team responsible for the original Vantage GT12 Coupe, along with low volume in-house projects such as the Vulcan, Lagonda Taraf and One-77 – customers can now commission ambitious full-scale design and engineering projects.

“Aston Martin has a growing reputation of building ambitious commissions for customers, perhaps the best example being the spectacular CC100 Speedster Concept. We have also become world leaders in ultra-low volume projects with cars such as the One-77, Lagonda Taraf and Vulcan, while the Vantage GT12 and Vantage GT8 show how far we can take our series production models,” said David King, VP and chief special operations officer.

“The GT12 Roadster is the first project to combine all of those skill sets in one magnificent car. In just nine-months we took a customer’s dream and realised it, with a fully-formed, exactingly engineered and fully road-legal one-off. That is the essence of the Q by Aston Martin service,” King added.