If you consider designing a custom NIO (carrier board)for Bedrock SOM, starting from Bedrock Cartridge is the way to go.
Bedrock Cartridge provides the following:
Highly effective 1st stage thermal coupling (TIM0) to the Ryzen die to a copper heatplate.
Coupling the heatplate to a heatsink/cold-plate is easy. Coupling the die is challenging.Provision for mounting NIO securely with accurate spacing.
Easy mounting of SOM to enclosure / heatsink / cold-plate.
This is challenging without the cartridge since SOM does not have mounting holes.Thermal coupling for SOM’s DC-to-DC converters
Mounting of NVME SSD
Not present on SOM itselfSecuring and thermal coupling for SODIMMs
RTC battery compartment