Thanks for sharing the schematics and CAD files for PCBA + enclosure. However, what I couldn’t find in those files was information on the wiring between the individual components, such as the wiring between the interernal PCBA and the extrernal connectors.
In the BOM, this seems to be e.g. 610-150-E, 610-145-A, 610-118-A which all appear to be manufactured by Nutaq, and are not standard parts available off the shelf.
Without that information, not even the connector pin-out, particularly of the combined UART + DC Power input is known.
It would be great if you could publish those parts, too.