customization - How do I remaster a Ubuntu cd into a Ubuntu cd with only Gnome Shell?

I was wondering if this was possible and easy to do.

I want to take my Ubuntu 11.10 64bit Cd and remaster it so that it will instead be a Gnome3 live Cd that I can install later install Gnome Shell with it instead of Unity.

I know that Fedora already comes this way but I don't like the rpm package format and love the deb package format along with ppa's.

I would also like to change some of the default programs on the cd as well as add other repositories other than the normal default ones.

Also I would like to include all updates to the files that came with then Cd when I was originally made to make it as up to date as possible.

Thanks for any help on this.

do what ever you want to do then after doing all the desired changes.Install remastersys
and view this tutorial