Not drawn by hand. The Principia works out what each feed describes and builds the model from it, in any sector, with no one defining the objects and links first.
Connections that carry consequences. A link is not just “supplies”. It states how a failure crosses it, how long that takes, and who could stand in, and every recommendation reasons from that.
Every statement knows its standing. Measured, inferred from a pattern, or stated by a named person. True from when, known from when. A figure that rests partly on someone's word says so.
It holds what hasn't happened yet. What should arrive next, and the explanations still open, sit beside the facts.
A model of objects tells you what is connected. The Principia tells you what each connection means, how far to trust it, and what it should be seeing next.