While the rule book does give some information & drawings the SFI book goes into much deeper detail in both written explanation & color coded drawings. It's well worth getting an SFI book. I would also contact the Chassis Tech in your area that will eventually be putting the sticker on your project. If you keep him in the loop he will answer specific questions as they arise. And, when the time comes to get it certified, you will have built it to his recommendations so there won't be any surprises.