Would it be possible to make a live Fedora DVD-RW, a fully
system with write access, enabling the user to carry his OS and data at
the same time?
You might be able to do this, but its not the common technique for live systems.
Generally the livecd uses tempfs for /var, /etc, and other writeable directories.
Another program exports or imports session data from a usb memory stick. I
suspect if you work on it and get it working, it will sound very abusive. The
noises coming from the drive will be terrible.
Maybe it has been done already?
There is already a Fedora Live CD (not DVD) that you can get from here:
I build custom LiveCD's of Fedora and it works fine.
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