I'm using the new 60 tooth version of the large turntable. You can use the older 56 tooth version, but because it is slightly smaller in diameter you need to use a 12 tooth double bevel gear to drive it instead of the standard 8 tooth gear.
When assembling the various gears, it’s important to make sure everything rotates freely. That is, don’t push the gears onto the axles too tightly, otherwise there will be a lot of friction between the gears an the Technic liftarms beside them. This is especially important when connecting the earth.
The model can be motorized by replacing the crank with a gear and attaching a Power Functions motor to it. There are many ways to do that, but you can see how I did it in the video.