the top of my ds had a little crack in it so i got a new replacement shell for it to fix
there was no problem with the ds just the crack
i watched this video and followed all the steps
http://www.youtube.com/watch?v=z06_wPRl0rw&feature=relmfu
but i got interrupted and never finished putting all the peaces back together and now i can be bothered but all the peaces were put away nicely in a box to prevent damage
so all you need to do is put the ds back together and you will have a working one :)
come with everything needed to do it and if you follow the video it should be easy to do
im looking at $25 for this or we can do a trade