Adapters for scsi drives are cheap and plentiful. Ask around or search here, i'm sure you will find something.
The classic by default has a 50 pin SCSI header right ?
Probably will do that when it becomes clear what I actually need. I -think- the internal SCSI header is 50 pin. External, of course is the 25-pin D.
Exactly. Then I think all you need is a SCSI hard drive i guess.
I don't know about the Mac Classic but on the SE if the drive is not Apple branded you will not be able to initialize it using the standard HD Setup SC (or something like that) app.
But it can still be done using a modified version of it.