Move the HDD's down one rack. Put a fan above the HDD flowing toward the GPU. Then put another fan directly above it towards the NB and CPU (midway).
Also, get rid of the PCI bay for the cathode switch. Use a rocker. Mod it to the case or paneling. Looks so much better. Also move the cathode box. unless that is where it works best. I know, the kits have terribly short cords :|.