It appears that we have achieved a deeper understanding of the architecture.
You has found some numerical metrics that reflect the scale of the subsystems, although there is certainly room for further data retrieval. I am aware that this information exists, but it is also known to be a challenging task to locate it. These details are often scattered across various presentations and documents and do not lie plainly in sight. However, they definitely do exist.
The final task is to try to find the initial requirements that were set for the main list of subsystems.