The Layers of SDL++

Right now SDL++ is a hodge-podge of ideas, but I would like to cleanly separate the additional functionality (starting with the extended event system) from the "raw" C++ code that interfaces with the SDL API. So, the first layer would map SDL_* to SDL::* without changing _any_ functionality (the "C++ SDL type layer"). The second layer would add exceptions around the existing functionality (the "C++ SDL exception layer"). The third layer will wrap SDL types into resource-managed classes. The fourth layer will add extended functionality, like the events subsystem (the "C++ supercharged SDL layer"). Clients should be able to exclude any higher-level layers if they so desire, but I'm open to suggestions.