Just wanted to drop here the company from China that helps us make most of the parts for these prototypes.
They made 1.3-meter-wide copper hemispheres 1.5mm thick, and 80cm ones, and 50cm ones . All of them you can see on the images.
They also cut for us the copper triangles for the Stela Octangula.
They cut a few of the copper discs for the antigravity device.
The bearings and the couplers, shafts, copper rods, and other parts come from this supplier in China:
They have great communication, reasonable shipping, and very good prices for the parts.