Hi Dave,
The wheels have about .5 inch more clearance (relative to the CCWs) between the control arms and the inner lip of the wheel, so in this respect they are pretty close to the CCW option that RCR spec'd for the car. I know it looks otherwise. The wheels are 3 inches wider than the 13 inch CCWs and the car as it sits in the pictures is 6 inches wider total vs the stock body.
The ducting for the areas you speak about are yet to be made, there will be separate custom sized molds made for ducting air to the radiators or coolers that end up behind those now closed off side panels. Since I do not know what size the opening will need to be in the end, I decided to leave then closed and flat for now. Make sense?
Additional parts are possibility....