Emax

Hello, I have a few questions about an Emax II, I thought maybe you
guys could clear some info up for me before I decide to purchase one...

I have the opportunity to purchase an Emax II, version 2212, in decent
shape but lacking the OS disk.  How hard is it finding disks for the
unit to work with; I need DS/DD disks, right?  Or can I use regular HD
disks?  Also, I know there are versions with internal harddrives, and
this is not one of them...  Does it still have the connections inside
for adding an internal harddrive?  I know it takes SCSI drives and I
think I have SCSI drives inside of a few really old apple performas...
Could I use those?  Sorry for all the questions!  Thanks!