When I had my zex kit everything was hidden. The control box was in the finderwell. I tapped into my cold air from underneath. I ran the line directly under the CAI. I even mounted the switch in the ash tray.
You can even buy duffle bags that slide over your tank, Makes it look just like your carrying around gym cloths.
Another big tip: buy some short lag bolts for when you mount the tank. It is so much easier to screw something in from one side and not have to hold the other side at the same time. (pretty hard to do by yourself)