My feeling is that with these sorts of details, it always boils down to either finding some small bits and bobs that almost look right (but usually not quite) and just making it up yourself from scratch. I used to get a certain thrill from being able to say something like "I made this from parts from an old alarm clock." But more and more, I'm realizing that the parts just look like parts from an old alarm clock.

What I'm saying is that at 1/3 scale those toggle switches might be large enough to see that the toggle should be thinner at the base than at the (rounded) end and to see the (tiered) hexagonal base and so on. Sticking a wire in a screw head might not cut it, if you really want to go all out.