Here are some switches that you can find on all kind of boats. Originally, they are developed for the Marinetic Scarab 38KV, but it will fit for many others as well.
It's a set of 2 different switch panels, one with 4 switches for trim tabs and engines, and one with multiple switches.
There are holes in some of switches, to illuminate them with 0.5mm (1.0mm in scale 1/8) optical fibers.
For painting, it's strongly recommended to clean the parts very carefully as they contain some wax on the surface due to the production process.
For painting I recommend the use of water born paints (e.g. acrylic paint).
Large board: 12.5 x 60mm
Small board: 12.5 x 18.8mm
Large board: 10 x 48mm
Small board: 10 x 15mm