this shouldn't be so difficult. you could build an image and test it in a chroot with easydebian. there are many howtos for using it for fedora and arch so why not trying angstrom. if it works try to install it on sd. make a thread or something and post your progress. if you run into trouble i'm sure there are people who will help. when you get it to work in a chroot i would test it on a sd card, too.