My original controller broked so I had to make a new one.
Here is the plan

Separating body and back cover

Separated

Facing the body

Pocket milling

After 3 hours

Outside shaping with roughing mill

Finishing

Rounding corners

Switch holes

Back cover inside

Back cover outside

And inside again. I maked it little bit lighter

Masked for painting

Painting almost done

Just a little bit of heat. 10-15 min in 200˚C

Here is the powder coating gun

And it's ready

I added more friction to back cover that it won't fall from table...anymore