A:
The platform on top of the tower is 4 feet by 4 feet. There is a 20x20 trap door in the middle of that space. To find out how tiny that is for 2 people, get yourself a piece of 4x4 plywood, draw a 20x20 square in the middle, and try standing in the outer space while another person stands inside the square in the center. And you're doing all that 10 feet up in the air. It's spooky, but it can be done. Be careful!