BTW, I used a Coby 512MB MP3 player.
And check out www.straightrazorplace.com if you get a chance. Its a great place.
Here is a video of it playing with the speakers I made for it.
Step 1: Tools Needed...
Dremel or similar tool
Needle nose pliers
Low heat glue gun
Spare wire, a few paper clips, wire ties...just the usual crap for improvising. LOL
Step 2: Opening the case and getting to the guts of the matter...
There will be some small screws. Just go slow and take your time. Make sure that you keep all of them for later use should you need them.
Step 3: Cleaning out the NESC...
Step 4: Stripping the MP3 player
Desolder the USB, headphone jack, and the power connectors.
DO NOT TAKE THE LED OFF YET!!!
Step 5: Cutting up the NESC case...
Now depending on the headphone connector you have you may or may not need to cut out the hole we talked about earlier. i ended up having to drill it out a bit, but you may not need to. Just see if it fits and go from there.