Convert Xbox Controller to Wii internals

I really want the perfect controller for playing wii shooting games, the one I have in mind doesnt exist! However the basis for it does, it is the followinig: http://www.amazon.co.uk/dp/B004KOUGJM/ref=asc_df_B004KOUGJM5393052?smid=A2TUOLEQQ8CFXE&tag=googlecouk06-21&linkCode=asn&creative=22218&creativeASIN=B004KOUGJM However I would like to map the controls to the wiimote and nunchuk, this should be relatively simple for someone with electronics skills, it is a matter of replacing the connections from existing buttons to the wii pcbs. these are all well documented.