Ah ha! I don't think this car does exist, as I spotted it a few years ago, and contacted the company behind it to see if they would like to display it in the Supercar Run at the Festival of Speed. The car's creator had to confess that it was just a rendering, but when (if) he did ever build one, he would let me know and bring it over to Goodwood. I'm still waiting!
I have his e-mail somewhere, but it will take some finding frustratingly
. He was from Iran, and had created a few designs based around mythical BMWs and Bugattis. I shall get hunting through my old e-mails now.