Lombard and booting from external SCSI

[B McKee]

I see from the YDL website the SCSI on my Lombard is listed as 'fully 
supported'
Does that mean I can install YDL (or something else) on an external 
SCSI drive and
be able to boot from that?   I know booting from firewire and/or? USB 
is a problem...
I'm running out of drive space and don't have the budget for another 
drive at present.
I suppose the other question is will the external SCSI drive have a 
consistant identifier
and what will it look like?

Brian