Can't you just unjar the glassfish.jar and then zip it back up as glassfish.zip? You still need to run the ANT script to create the domain and generate the configuration files. Or is running the ANT script what you are trying to avoid?
[Message sent by forum member 'djsceats' (djsceats)]
http://forums.java.net/jive/thread.jspa?messageID=354941