Creating an Alternate Install CD with pre installed users

I want to create my own customized Ubuntu derivative and this question already gave me a very good start. My requirements are quite specific I want to roll out a CD with

• Set of users who are supposed to run them (root, admin, guest) pre-installed
• With their passwords already set
• Installation not asking for creating users on booting or during OS installation
• Autologin to guest user

Is this even possible?

Thanks to the community in advance :)