I think what you are asking is how many ways are there to LOWER the profile of a rat rod body. You pretty much named them all, except for Z-ing a frame, bagging, and stuff like that.
i guess my thoughts were not clear, I'm thinking along the lines of a dictionary. maybe with pictures illustrating how many different ways to customize a rat rod. I know its almost limitless but I figured kind of fun to think of.
There are already some good books on the subject. I'm not sure why it has to be a rat, wouldn't chopping techniques be the same if it was just a regular hot rod?