i'm doing with uck tool to get customized ubuntu live image(kernel).

it can be fully customizable with it,
but i can not change desktop shell.

normally, on the boot with the live cd, there's no log-in session,
so i just want to do is as below...

"after boot with my live cd, autostarted with only my application(ex, gedit) and
painted with my wall paper with some logos"

in other words, is it possible to change desktop shell to my application, and there's no
desktop icon, task bar and panel.

help me.
thank you.