Design a PCB for DC power management

Please only apply if you understand the requirements. Generic intros and questions will be ignored.
You will likely be selected if you show that you read the project description.
One way to do so is to write a quick overview of how you would design this PCB and which parts are critical, in your opinion.

We are looking for someone who can:
- Pick parts
- Design a PCB
- Have it manufactured
- Maybe: test it
Bonus: Write a firmware, or I will write one myself

You will design a power management box for telecom applications.
Design voltage is +/-48V
16x 20A battery inputs
16x 6A load outputs
8x mid-span PoE injectors (passive 2-pair/4-pair 48V)
2x 100A inverter/charger interfaces
2x 20A Aux in/out
Remote load control using IP over Ethernet and Wi-Fi
Soft & Hard fuses on all outputs
Bidirectional power monitoring for every power input/output
Joule counting (this could be done using an external system like a Victron BMV)
The design must be reasonably compact, so a stacked PCB design will likely be needed.

Attached is a picture of a box we designed for this function.