] RHUM is an easy to use script for merging updated RPMs
] into a RedHat style distribution. RHUM can merge RedHat's
] RPM Updates and your own custom RPMs into the copy of
] RedHat you use for Kickstart installs, eliminating the
] need to apply RPM Updates after install. This script can
] also use Fedora Core has a base for building custom
] distributions.

I have updated RHUM to work with Fedora Core. You can now create custom Linux distributions based of Fedora using RHUM the say way as RedHat 6 through 9.

There is also a crude script linked from this page that will create a network install base using the yarrow images.