I made a case from aluminium around the original case:
After some filler, sanding, filler, sanding, painting, sanding, painting:
The back side (other color):
I had to much voltage drop over the usb-cable (The display uses 500mA). Therefore I made an extra cable that provides 12V from a molex plug inside the pc. In the display case I’ve put a switchmode 5V regulator.