Where can i find free or cheap instructions and diagrams to make a Go Kart?

Me and my friend are a Go Kart and we are getting stuck at certain bits in the process of making it. I was just wondering if anyone knew a website or link to a good set of diagrams and instructions on the frame, steering, motor mounting etc.

http://hubpages.com/hub/Build-Your-Own-Go-Kart—A-Step-by-Step-Guide