Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5903867.

In my define 7 the optical drive has a silver body, and that looks awkward through the window. So I designed a cover, which now will be held in position with three magnets.

The holes are designed for magnets, 8mm diameter and 1mm height.

You should use a flat screw for the DVD Mount.

Now it looks way better.