Hi
If you Google usb enclosure for dvd drive
you will see a variety of options (ebay Amazon etc)
Check if your drive is SATA or ATA/PATA
and SATA if it uses a standard power SATA connector for slim DVD drives
I have seen Dell ATA DVD drives with converter board for SATA which might be too large for case
Even external slim line DVD drives are cheap nowdays
regards
Mike Barnes