Design based on the BRIDGE of the flying saucer being bent around the mix axis of it. This gave me the Design of the cylinder in the center having the function to have the bridge around it totally in 360 degrees. Then it was easy to define the difference of the human type rotational gravity and the Alien type.The clue was that the bridge could be made into steps around the center cylinder that became the concept for the spiral Surface stages.
observe how the stages 1,2,3 are related to the inner cylinder Surfaces as each cylinder increases size and spiiral gravity.