I had nothing better to do...

Have you opened up the nunchuk to see what's inside? I suspect it's mostly empty, with only a small PCB

Yup. Check out this thread where someone opened their Nunchuck and found so much room in there they put their Atmel and XBee antenna INSIDE it.

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1215475673