Cool color. I understand you were using a spray with a granite like paint - is the paint layer over the acrylic resistant to touch / scraches?
I will also be painting the front, the top and the rear acrylic panels of my G4, but I will most probably paint on the internal side of the acrylic - I will just take out the current silver painting and paint in black. I believe that way I will keep the translucident effect of the external side of the acrylic and the painting will be also protected.