If you're skilled and have A LOT of patience and the organizational skills to keep track of 20 different types of tiny screws, then game on!
I haven't taken apart a macbook, but I know the 12" Powerbook inside and out. I did a bunch of customizing (mechie.org) but lost interest and patience to put it back together. Admittedly, the customization made things MUCH more complicated, but even putting it back together the way it's supposed to go will take lots of patience. Just be sure you have the time and energy to follow through...or make friends with a Mac Genius
I'm not an expert, but i love tinkering as well, so i'd be happy to give any put i can.
G'luck!