PCB Schematic design for nucleof446 expansion board

I have attached a block diagram. PCB board is having one power slot with 24V 40A. Other power slots (Nos 3-5) in the range of 10A. Mosfet load switches need to be designed to switch power slots. Also automatic power supply switching from main smps supply to battery supply need to be implemented. Project milestones are:
1. Project specification requirement analysis and finalization.
2. Schematic diagram and electronic BOM.