Modular HDD holder

This is a modular HDD holder. There are screw sloty on each side to be able to secure it to the drive and 3 buttons on top and 3 holes on the bottom to make it stackable.
[UPDATE]
1.2 is for smaller height drives only. The upper layer becomes 1mm thicker to have bit more robustness, but not all the drives can fit into it. (e.g.: old maxtor drives are usually thicker then other drives therefore they wont fit into 1.2)