I would be worried about cooling with how your batteries are spaced. The way you have that laid out, there is absolutely no airflow. You need to make a proper path for the air to flow to keep your wii cool. The last thing you would want is to complete your wii portable and have your wii die from overheating. Try making a path for air to flow in and out of your case through the fan and heatsink. Sorry to mess with your design, but this is important.