wiimote pinout and hacking

Has anyone here done any wiimote hacking? i.e opened up there wiimote and messed around. I am looking to do a controller conversion mod and need to remap some buttons, etc. It doesnt seem like it will be too complicated but while I wait for my triwing I was hoping to get some info. Being the first button remapping mod I've planned, any general info on controller hacking would be useful. I have Ben Heck's book (and checked out his forums) and checked out a few places online but it all seems so I easy that I feel like I am missing something. Thanks in advance.