1. Drill a hole in the top right corner 16.5 mm from the top and 30.3 mm from the side using a 13/16 inch drill bit.

2. Drill two holes in the side 30 mm from the short sides and 27 mm from the long side using a 1/2 inch drill bit.

3. Screw in two waterproof cable gland connectors to the side holes.

Put in a button in the rocker switch in the other hole.