The CD-ROM in the CD32 is neither SCSI standard or even early IDE. It's like in the old old days when you bought a CD-ROM drive for PC and it came with a specific ISA interface card for the PC like for Sony or Mitsumi or Panasonic all being different.
For this reason case mods for the CD32 are a bit of a dead end, shame really it's the most compact AGA motherboard available.