Originally posted by Captain Colonoscopy
This is what I would do: Put an intake blowhole approximately somewhere in between where you have marked for holes, take the shroud off the CPU fan and put in one of those PCI slot cooler blower fans for additional exhaust. Should provide good negative airflow. Although I must agree with the previous post about what good it will do. You won't be able to over-clock anything and it probably won't make your system any more stable. It would give you some valuable practice for a future project however. Good luck.