i did one of these the other day so easy and it works great i mounted the pic on the outside of the wii so i can change the code on the pic easily and without having to take the wii apart
not sure if theat is possible as the 12f629 doesnt supprt self flashing. luckily for me i poke about with old aracde machines all day long so i have a phalanx of eprom burners to blow pics in