Now that's cool. Is there nothing that Walmart doesn't carry? I'm always amazed by them whenever we go to the U.S.
My only concern would be the pins on the top of the battery thingy (believe it or not, 'thingy' has recently been dubbed an actual technical term). They look a little scary. I don't recall seeing any kind of receptor for that in the battery compartment on the d5k.
Otherwise it looks doable.
The bliss of ignorance is not knowing what your limitations are.