Well I got round to it on tuesday, but been waiting all this time for the video to encode, which it refuses to do, so for now it's pictures only.
Wii Nunchuck Mod - a photoset on Flickr
In short, it cost me £1.35 for the bits and sandpaper, I already had an electric drill and Tri-Wing screwdriver, and it came out really well and is a VAST improvement to gameplay, it's actually enjoyable again!