It is finally done...
Here is the base part:
https://library.ldraw.org/parts/41755
Here is the complete assembly including the 1x1 round bricks to suspend the gondola
https://library.ldraw.org/parts/41759
Here is the base part:
https://library.ldraw.org/parts/41755
Here is the complete assembly including the 1x1 round bricks to suspend the gondola
https://library.ldraw.org/parts/41759