Hi
With almost no exceptions, every board I do has full ground pours on all layers.
Really? Where do you put the traces?
Kidding. RF PCBs are another kettle of fish with weird outlines, bizarre shapes, holes, slots, odd devices sitting at all kinds of heights, etc.
I just like things nice and neat because my scripts rely on various checks before making gerbers and some designs just always report unrouted connections.
One design is 4 separate boards from one schematic that are soldered to the enclosure. The enclosure is the ground for the system.
Either that or you make 4 schematics, 4 part numbers, 4 layouts, 4 sets of gerbers, 4 POs, 4 BOMs for something that is really one design.