Anycubic Predator D Raspberry Pi mount

I've used this case design on several of my printer projects as it's a nice simple design with good mounting lugs and holds the Pi securely with full access to the necessary slots and port required for Octoprint.
My latest purchase has been an Anycubic Predator D which has proprietry castings / extrusions for the main frame and I can't bring myself to drill holes in it. The electronics are contained in a steel enclosure at the top of the printer and whilst there is sufficient room inside for the Raspberry Pi, the additional heat was a concern and I also felt that the steel enclosure might limit the wifi reception so I elected to mount it outside.
The remix consists of some new countersunk holes in the base of the case which align with the hexagonal punched holes of the grille of the printer. There is a frame which fits on the inside of the electronics housing which holds 4 x M3 nuts and the base is screwed to these with 4 x M3 x 8mm screws. You have the choice of top cover and I