It's always nice to have a physical book IMO...but here are a couple of links to start with. PDF versions of the 72 service and overhaul manuals:
http://www.mediafire.com/file/nv3m0s...to_30.pdf/file
http://www.mediafire.com/file/8s28b5...anual.pdf/file
Also a quick search of the board will turn up pics of K5, K10 and K20 builds that will show a lot of what you are looking for. I've got two in my signature. It's always good to start with a search first.
Best of luck with your project.
Brad