REMOVE the plastic cover to avoid knocking it off in the process of working on the drive bays. (Just a precaution - kind of like not setting a glass of red wine on an elegant white table cloth.)

The Comments appended to these instructions are VERY helpful. If you read them you will save time, and avoid some of the mistakes I made - particularly with respect to the Drive mounting screws located to the left side of the drive installation bays, and the need to remove the bottom drive FIRST if you wish to access the top drive. THANKS for a great set of instructions.