That's a pity, it was a pretty fine resource. I used it to write my xkb
conf. However, I'd like to throw another helpful document on configuring
xkb. Not as vast as charvolant, but it helped me a lot too.

http://pascal.tsu.ru/en/xkb/

Not sure if it helps you, but I could send you my config with some
comments off-list if you want.