IMO, assuming you plate the poker // gh60 the aluminum case is a waste of time\\coin..
there's no "top" for the poker to be shone off.. If just the "sides" the metal aluminum sheen isn't all that impressive. because it would be dependent on "grain"
And for the people that PAINT their aluminum cases instead of dye.. that's just a whole new level of wasting money on aluminum..
Some people might think it adds rigidity... This is probably true, but we're looking at a "very short" PCB and if plated, that eliminates any flexing that you could possibly feel from the pcb..
and in the case of the GH60, the PCB is already very good..