@Erik Leppen
I don‘t think the motion will be a challenge, the only problem i see, is to make it very sturdy.
If you look at the first picture, you can discover a small turntable, and a shaft
The circle is built with connectors (4107082), which are stabilizied with a sturdy construction. It was testet irl, and it works fine.
But yes, you are right, i should probably start building the main structure before deciding on color schemes. I underrestimated the whole project. Thanks Erik :)