If you look at this picture:

http://www.riocar.org/modules.php?set_albumName=albun01&id=aae&op=modload&name=Photo_Gallery&file=index&include=view_photo.php

I'm not sure how this was made, but it looks like a great idea!

I thought he described the procedure in that gallery. Basically, he dismantled his factory stereo, and and glued the buttons and fascia together to make that cover. Lots of creative Dremel work was involved, I'm sure.