Here are the components that make up the box. It has a nice base plate with clips securing the lid.
The cover was a neat fit and all the holes were well positioned to receive the many cables. The ducting spreads the airflow across the heat-sinks below.
I drew the new fan ducting in Sketchup...
Moving the electronics from the front of the printer to the side has given greater access and visibility to the print platform and extruder. I'm very happy with the new location of the electronics and of course the cover.