The HD tray/caddy is out. Can see another big hole on the underneth of the mod-case...to allow air circulation. There is a space between the DVD Enclosure and the mod-case (about 4mm) for air.
Now I don't have to take cables out to use the DVD Drive. A turn of the keys takes power off the HD...
1...turn the Drive switch off...at the back.
2. turn the HD Keys...to take the power supply off.
3. Turn the drive switch back ON to use the DVD Drive.
reverse to use HD.