Coops, did you ever swap the shell for your 350 and how did it go? A friend in Europe sent me a used blue 350, but the screen is badly scratched, even has a good sized gouge in one spot. The blue shell itself however is perfect and I'm really tempted to swap it. Depending on how you hold the reader, you can avoid noticing the scratches, and it works perfect as is, excellent contrast on the screen, but I know the scratches are there and it bothers me enough to want to swap it.
Looking at the schematics I can't really tell if the front of the shell will be any problems replacing and I don't want to kill 2 devices in swapping the shell.
Or has anyone else swapped the casing on their x50 reader to know how easy it would be?