[CentOS] PXE Boot Live CD

Hello Guys
We are starting a project's desktop virtualization, I'm trying to create an
image centos to install Citrix Receiver for q clients the machines do not
need HD.
Among all tests q I bumped into two "errors":
1. Install Centos
2. Foreign q there is no bootable image
I studied various contents on the internet a list of them below:
https://projects.centos.org/trac/livecd/wiki/PxeBoot
https://projects.centos.org/trac/livecd/wiki/GetToolset
http://www.bestlinux.com.br/index.php/dicas/126-distribuicoes/2609
http://fedoraproject.org/wiki/How_to_create_and_use_a_Live_CD
http://pkgs.org/centos-6-rhel-6/epel-i386/livecd-tools-13.4-2.el6.i686.rpm.html
https://projects.centos.org/trac/livecd/wiki/CreateImage
https://projects.centos.org/trac/livecd/browser/trunk/CentOS6/rhel6beta-livecd-minimal.ks?rev=88

https://projects.centos.org/trac/livecd/wiki/InstallToHardDrive
http://unixrevolution.blogspot.com.br/2011/12/pxe-boot-livecd-image.html
http://pkgs.org/download/livecd-tools
https://projects.centos.org/trac/livecd/

Besides these follow this tutorial to create the tftp server.
http://practical-tech.blogspot.com.br/2011/10/how-to-configure-pxe-server-in-rhel-6.html

If anyone has any tips thanks.
Thank you!