Much of the documentation I read on the World Wide Web suggests using revisor to create a custom Spin of Fedora. I find that revisor is not well suited to my needs. I use LiveCD Creator. To install it:
yum install livecd-tools -y
I suggest you install the fedora-kickstarts and spin-kickstarts packages as well.
yum install spin-kickstarts* -y
Another tool I use is liveUSB-Creator.
yum install liveusb-creator -y
Once you have those installed you can use your favorite text editor to modify the existing Kickstart files to suiit your needs.
The files are installed by default to the /usr/share/spin-kickstarts/ directory. Be sure to save the files as different file names once you have edited them to suit your needs.
I save them as fedora-custom-base.ks and fedora-custom-kde.ks
Once that is completed you can run the liveCD Creator to create the custom spin in the directory you wish to save the .iso image to.
If that command completes successfully, you will have a F13x64-Custom.iso in the directory. If it does not, the kickstart file has an error.
Next you can use the LiveUSB-Creator tool to burn that custom image to a USB drive. Be sure to create an overlay when doing so. I use 1024M as my overlay size.
For a more detailed article on creating a LiveUSB drive visit the following: