Getting "ripped" will be mostly down to your diet.
I think adding that cardio throughout the week might be a bit much. You should get a pretty great cardio workout at Crossfit, right? I don't Crossfit, but am somewhat familiar with the exercises and the way the workouts go in general. I think you should go try a few classes and see what you think in terms of your training goals. Ask the Crossfit trainers what they think about your plan.