I saw a BMW M3 with the Lambo-style doors. Looked great! It was in the Feb -03 issue of BMW Car. It's a magazing out of London. They had the name of the company this did the doors. But it was alot of work according to the article. You have to strengthen the A-piler and design a hinge that moves the door up and out to clear the occupants. Otherwise you'd take the lower portion of the door in the face everytime it opened. The company that built it was Hamann Motorsport.
www.hamann-motorsport.de Might have some ideas for you to consider. Good luck with your project.
