Miller MotorcarsMiller Motorcars is a luxury dealership based in Connecticut, in the United States, and while it is famous for dealing with some superb luxury cars, you perhaps wouldn't associate it with a bespoke supercar. Enter the new Miller Motorcars JC9, a special one-off from designer Jason Castriota created in collaboration with the dealership.This is a sensational coachbuilt project, keeping in with the tradition of some of Castriota's previous designs. Castriota was behind the design of the Ferrari-inspired Pininfarina P4/5; however, the new JC9 closely resembles a German Le Mans legend, while it also uses a German car as its underpinnings.Fans of endurance racing won't have failed to notice how similar the car looks to the Porsche 917, one of the greatest cars to ever race at the French endurance classic. The JC9 is even finished in colors reminiscent of the famous Gulf '917 that appeared in Steve McQueen's iconic Le Mans film.AdvertisementAdvertisementBut under the skin, it doesn't use the '917 as its basis. In fact, the Instagram announcement of the car tells us that instead it is the Porsche Carrera GT that provided the basis for this incredibly beautiful-looking retro supercar.How Miller Motorcars Created the JC9 SupercarThe car was unveiled at the start of June, with the covers being taken off the car at the famous Lime Rock racing circuit. Designer Caotriota was not only responsible for the P4.5, but also the Ferrari 599, Maserati GranTurismo, Bertone Mantide and the SSC Tuatara.The Porsche 917 served as the inspiration for the JC9's design, right down to the Gulf-style colors that adorn the coachbuilt supercar. At the front are large headlights, with a low nose and a small, slender grille, and head-on, the car looks particularly beautiful. At the back, it is clear to see that a Porsche Carrera GT was used to create this awesome car.Miller MotorcarsAt the rear, we can see the 5.7-liter V10 from the Porsche on full display. But aside from that, it's hard to tell that this car was once a Carrera GT. Parts of the Porsche's rear bumper have been retained, but now it has fins on either side. The back is a work of art, with the rear quarter panels and clamshell seamlessly running through to the twin-plane rear wing.The Porsche Interior Was Also Substantially ModifiedMiller MotorcarsInside, there are tell-tale signs that this was once a Porsche supercar. However, it has still had some extensive changes. The retrimming is the most notable of these, with the car boasting a gorgeous new blue interior color, with Alcantara and baby-blue painted accents. Pleasingly, the center console shows us that this car still has a manual transmission under the skin.AdvertisementAdvertisementThat transmission was a six-speed manual. Assuming the engine hasn't been modified, this car should produce 603hp and 435lb-ft of torque. What we aren't sure of is how long this car has taken to produce, nor how much the JC9 has cost to make. What we do know, though, is that this was a one-off creation for a single customer, meaning you have no chance of ever being able to get your hands on one. If it was ever to enter production, however, we don't think they'd be sat on showrooms for very long.If you want more stories like this, follow Guessing Headlights on Yahoo so you don't miss what's coming next.