question about creation of updated DVD iso

I have read instructions at http://fedoranews.org/contributors/gene_czarcinski/update_distro/ I have basically one question: how to update the vmlinuz and initrd.img files to put under isolinux directory of CD/DVD, so that the installation kernel is the 2111 one and not the default 2054? Do I have to compile the kernel source rpm with any specific target? I remember in rh el 3 I was able to use a specific config file for the installation kernel... but it seems it is not here in Fedora. Is it the i586 one? And what about the initrd.img file generation? Thanks in advance for your answers. Bye, Gianluca