I'm not sure about the convertible rollover hoops being used in a coupe, however, for this kind of thing, if you go to a good shop that does race chassis builds or mods (including roll cages), they would be able to fabricate something for you. How it would actually look inside the car you'd have to discuss with the fabricator and would be dependent on their skill level and probably how much money you are willing to spend for time and materials. I suspect that if you went to scca's website and looked for your local scca forum, you could probably find some people in your area with experience with local shops who could make some recommendations.