Hema have a book out, Day trips from Perth, haven't got it myself yet but will do soon.
4-wheeling-in-western-australia.com/dwellingup.html page might be of interest to you. Cant link it as a hyper-link just yet.
I have 4WD Days out of Perth, if that is the one you are referring to, but have found most to be just soft roader tracks. Will try 4-wheeling-in-western-australia.com.