What is that you are trying to do? From reading your post, you copied a Gentoo LiveCd to your hard disk and made several modifications. Now you are trying to repackage it into a new LiveCD (am I wrong here?).
Frome the livecd-ng
Creating a Gentoo CD
This document will guide you through the process of creating an iso image of
a Gentoo LiveCD. The LiveCD is a bootable, fully functional Gentoo system,
run off of a CD. Most often they are used to install Gentoo, but they are
also handy as a rescue CD or demo.
The LiveCD is essentially a stage 3 build of Gentoo with a few extra
packages for whatever application the CD is to serve.
Seems that it should be able to create a custom live cd.
There is an updated tutorial here:
If it doesn't work, you could try http://www.linux-live.org/.
They have bash scripts that will create a live cd, but it doesn't work with 2.6 kernels.