Ignition/starter /accessories switch boxes.... Any ideas welcomed...

Trying to visualize on my 71 Scamp a place to put them and the only spot I could think of would be the ashtray like you mentioned or perhaps, on the small lip on the bottom side of the dash or how about a overhead console like above the mirror. Might be able to use where the mirror mounts as the main support for it.

If your not good at Fabbing, perhaps younggun2.0 might be willing to make something for you..