British coachbuilder Qwest has just revealed its latest project – a one-off Tesla Model S wagon. According to Autocar, the Norfolk-based specialist has been working on the project for over a year, and is well on schedule for completion by Christmas this year.

As seen in the pictures, the entire top-rear section of the vehicle have been redesigned. Materials aft of the B-pillars were chopped, and in its place rests a custom-built enclosure made entirely from carbon-fibre (CF). The CF top – supplied by specialist car part manufacturer that usually crafts Formula 1 car components – then gets bonded to the car’s original aluminium chassis.

Notice the missing windows? Those too require custom manufacturing, and the company has named Pilkington as its supplier. The painting process, on the other hand, will commence later this week.

But how did this project actually come about, you ask? Well, Qwest managing director Dorian Hindmarsh said it was actually an outcome of a conversation he had with an entrepreneur friend, who wanted a more spacious car with all the qualities of the Model S. The sloping roofline of the original car simply doesn’t allow enough room.

Naturally, one can only imagine the cost of a build this ambitious. The figure starts from £70,000 (RM385k) and is separate from the cost of the car, which starts from £58,600 (RM323k) for the base 70D model. Of course, pricing is subject to customer’s requirements and specifications.

No details pertaining to its performance have been revealed as yet, but Qwest hopes to set the record for the fastest-accelerating estate-bodied vehicle. Currently, the title belongs to the Porsche Panamera Sport Turismo Turbo S E-Hybrid, which manages the century sprint in a blistering 3.4 seconds.