The apocalypse book has some decent pics for scale purposes.
I'd look for something that would work as a basic shape. Perhaps a plant pot or something.
I'd make sure to spend a lot of time planning, get most of the weapons built before you start going to town on it, make sure the joints look like they would work. All of these things, if not done... will make the model look like ass.
So once you get the book, start working on getting items together for weapons and different parts. By breaking the models construction down into smaller parts it will be more attainable.
