not necessarily. There is a lot of info on case construction, screens, painting and what not, but there is little on xbox modding. due to the what, 2 portables that have been made? Id look at xbox scene or xbox linux for more info on xbox related stuff. Im also making a laptop and i am in the case construction faze.
Well actually there is a lot of information. The case construction can tell you anything you need to know and more, there is some information on how to power an xbox, and I'm sure you can find the a/v pinouts with a little poking with a multimeter. So yeah Skyone is right.
I remember tons of xbox case mods back in the old says of xbox scene. Making a laptop wouldnt be too much of a stretch. Maybe looking at ben's xbox 360 laptop tutorial will give you some ideas.