Amitrix made a device for the CDTV that used 2.5" SCSI hard drives.
I had a bit of a look around but cant find anything RE SCSI headers on 2.5" devices.
Anyways, if you use the info from the top of the device & get some info on the Pin-outs for the Go Drive itself, you should be able to lash up a Data cable & a Power cable all in one.
You would need a 50 Way 2.5 Header for the drive itself.
A 50 way header for the 3.5" SCSI Contoller header.
Info on the 3.5" SCSI header Pin outs.
Info on the 2.5" Device pin outs (Data/Voltage)
Some of those 50 way wires from the 2.5" device are power & you will need to know what Volts to throw at it & choose an appropiate way to get the Volts right from your Miggy. 12 & 5 are available from the PSU, so may have to figure out a step down. Dont take Volts away from your Mobo as this may damage/deplete/load the mobo components.
I guess you`re just looking at a way to use the drive kicking around eh!? ;-)