Hi Smerf -
generally agree with your guide on SCSI except that the Amiga narrow type SCSI handles 8 devices not 7. The 8th device is the controller having SCSI ID of 7. As I recall Commodore always (sometimes?) set the hard drive to device 6.
I know the order doesn't matter but I always set my system hard drive to device 0 and the ZIP drive to device 6.
Amigoat