UPDATE: AutoDMG makes this process, "stupid easy" so I'm going to move away from the below to using that tool. Also, if you're master distribution point is a JDS you cannot compile configurations. Again AutoDMG to the rescue.
Ever since Casper Admin has allowed for compiling configurations way back in the 10.5/6 days I have been successfully creating an OS.dmg via Casper Admin. I still use this method today & since 10.7 this DMG also includes the Restore Partition.
The end result is an DMG of the OS that has never been booted & is an asr image. Much like DMG’s created by InstaDMG & AutoDMG.
I’m not sure why I seem to be the only one doing this, but below is the how;
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