Hey Nym, I did some tests and the 20 meters sphere is the most easily movable and scalable. Here is a pic demonstrating. I resized it larger to get more space inside. Keep in mind this is just some test I did to view the feasability and I will tweak the sides.
Just wanted to show you. You advice helped me a lot. Everything was clear.
I know it is huge. But I dont really know the space needed right now. File size is 396kb