I finally managed to spray paint the cover of the left drawer. Used some aluminum primer first, then three layers of white paint and two layers of coating.
Disassemled drawer 
Spray painted with primer 
Finally some good weather so that I can use my paint box on the balcony 
The final result
The installed front cover:
Still to-do:
- Re-print the left cover
- Spray paint the left cover
- Sand and spray paint the mount for the aquaero computer (middle section)
- Eventually paint the card reader cover (as it has not the same white as the rest).
chspeedy.com 