[CentOS] Install CentOS based distro

Hi,

I'm making a dedicated distribution based on CentOS 5.1

My doubt is about the installation of the "new" distro.

I was thinking about a (K)ubuntu kind of way: the CD/DVD boots, a
graphical interface appears with an "Install" button, just a click on it
 and then just wait to finish.

Now, I'd like to avoid building RPMs for my added software. Is this
possible this way ?

Other suggestions are welcome.

Any help would be appreciated.

Warm Regards,
Mário Gamito