Drop Oliver an E-Mail, he's well up on CDTVs and "has a few".
Or just wait for me to wake up. ;-)
Its there any realistic way to use a scsi or ide drive with a cdtv?
SCSI yep, IDE nope not without turning off all the CDTV specific bits.
The CDTV has a rear expansion slot designed for an SCSI card, (or Arcnet networking card, never made) the drivers are already built into the CDTV's Roms.
Commodore made a great looking external case/scsi controller for the CDTV but they sell for a lot of money when they come up.
A much better option is to surf eBay as a few WAW SCSI cards come up now and again.
These cards just slot in and have an internal 50 pin SCSI connector for a standard SCSI drive and an external connector.
The best option is an external harddrive but lots of people (including me) have fitted one inside the CDTV without any problems.
There is just enough space below the motherboard, between the MIDI PCB board and the memory card slot carrier to jam a harddrive in.
IDE is a no no, you can fit an A500 ADIDE card (fits under the 68000 CPU) but it screws up the CDTV's built in software so you would have to disable all the CDTV features... which sucks. (I have been told it doesnt work, dont have an addide to check)
Also note the 40 pin connector running to the CD-Rom drive is not ide and you can not connect a harddrive to it, sorry.
Hope that helps. :-D