Compiling ubuntu

Hi there,
I've compiled u-boot-mini6410 and linux-2.6.38 successfully. The next thing
I want to do is to compile Ubuntu source from the DVD. However, I couldn't
find the way or scripts to do that.  Does anyone know?

Cheers!

I followed the instructions given in Ubuntu guides a Xubuntu image in EXT3
for SD. It works great! However, I would like to go one step further which
is to compile the Ubuntu source, so that I could add more applications,
drivers and etc. Any comments are welcome.