You've been re-building the theory in your mind for the last 10 years. A better word for theory (I would propose) is mental model. In fact, as soon as your ment

You've been re-building the theory in your mind for the last 10 years. A better word for theory (I would propose) is mental model. In fact, as soon as your mental model of the system is complete enough, you might as well re-implement it. It will be easier to understand and maintain.