A carpark in OpenGL using C++

I need a carpark with 2 or more levels. Inside it I want some objects, i.e cars, and I also want an entry and exit to the carpark, with the levels connecting with real roads. There has to be a decent amount of collision detection as well. A first person camera will be useful. Any more details, will be discussed upon request, just send me an e-mail. As stated in the description, the project must use OpenGL along with C++.