unattended FreeBSD install

[Dave]

Hello,
I've read a howto on creating your own FreeBSD isos located at:

http://romana.now.ie/writing/customfreebsdiso.html

and i'd like to combine this with an unattended file install.cfg i believe 
it is. My goal is to go to a box, boot it from CD, then walk away, come 
back, and the OS including patches is insalled and ready to go with custom 
packages already installed. If anyone has any working configs, so far my 
atempts to create an unattend file, have not been successful, i'd appreciate 
them.
Thanks.
Dave.