Despite sharing a platform with the BMW Z4 Roadster, the 2020 Toyota GR Supra is only available as a coupe. According to the sports car's chief engineer Tetsuya Tada, a convertible version has been ruled out because "the relationship between the Supra and the Z4 resembles the relationship between the Porsche Cayman and Boxster."

To fill the void, students from Japan's Nihon Automobile are building a one-off 2020 Toyota GR Supra Spider. But rather than simply chopping the roof off a Supra coupe to convert it into a Spider, they decided to base their project on a Lexus SC430 Convertible.

The finished car will be shown at the 2020 Tokyo Auto Salon next month, but the team has shown some work-in-progress photos on the Instagram page to show how the project is progressing.

While the one-off A90 Toyota Supra Spider is based on a Lexus SC430 Convertible, the bumpers and doors have been carried over from the standard Supra, although the doors now open up like the scissor doors on a Lamborghini. Other parts such as the hood and trunk are custom-made, while a body kit with extended fenders and a large front splitter gives the one-off Supra Spider a more aggressive look than the standard car.

There's also a custom decklid that features an integrated rear spoiler. Photos posted on the Instagram page suggest the design is inspired by the Toyota Supra driven by Paul Walker in 'The Fast and the Furious.' We'll have to wait and see if the completed car features a similar orange livery as the movie car.

Under the hood, the Lexus SC430's 4.3-liter V8 has been swapped with the legendary 3.0-liter turbocharged straight-six 2JZ-GTE engine that powered the fourth-generation A80 Supra, which will no doubt be heavily tuned to produce an insane amount of power. We can't wait to see the finished project unveiled next month.