Thanks for the link steelgoose. It looks like an outer box is a yes. It’s still not clear how incoming board and outgoing wire connections will look like together though - like Fz, the eagle symbol seems to only have one connection point too.
Thanks for the red boxes suggestion Old_Grey; I am having trouble visualizing exactly what you mean for which connector - too late at night.
Actually, the upper connectors (the larger socket ones) aren’t ‘promiscuous’; they are designated as female connectors and this seems to stop them from mating with board connectors below unless you make them.