Create and sign Country specific XO image

[Philipp Kocher]

Hello

Cambodia is getting 1000 new XOs very soon. This are the first ones with 
a Khmer keyboard.

To make the installation process easier, I would like to create a 
country specific image based on build 802, which includes Khmer keyboard 
support, fonts, the newest language pack with software translations, 
Activities and some customizations.

I found just very few information about creating a country specific 
image (mainly from Nepal):
http://tiezemans.wordpress.com/2008/12/30/customizing-the-xo-image/
http://blog.olenepal.org/index.php/archives/183
http://wiki.laptop.org/go/Customizing_NAND_images


How can I get a country specific image file signed?

Which other customizations or bugfixes are recommended to be included 
(e.g. like the ones from paraguay 
http://lists.laptop.org/pipermail/devel/2009-March/023788.html)?

Detailed instructions from other deployments about creating an image are 
very welcome.

Thanks and best regards,
Philipp