You dont have to strip the case first.
All you have to do is remove evrything that could get damaged like power supply, switches, led's, etc. Get bucket of hot soapy water, wet sand the surface with something like 800 grit or so wet/dry sand paper.
Then use polyurethane paint, automotive type.
Lay on your base coats.
if you want it to come out really nice you should scuff the surface with those green 3m pads between coats...when it drys of course.
When you think you have enough of a base coat, do some more wet sanding and then do your clear coats. You can sand between clear coats if you want an even better shine.
Now after it thoroughly dried...36 hours or so. Mask off your design or air brush your design,let dry, scuff some more and clear it again...you will have a finish that looks like a deep pool that you could dive into.
zogg