Without actually giving you any of my coding, I can tell you how to go about finding the information you require.
Firstly, Disk Copy has an AppleScript dictionary. Go to the file menu in Script Editor and 'Open dictionary...'. There are dozens of commands laid out for you.
Or (and this is how I started File Smiler), in Script Editor, hit the record button and do what you want it to do. Disk copy is recordable. I know you can't record making a self-mounting image, but there's alot there that recording will help you with.