I have a play area we are going to be building an area for. Problem is the area is tight. The owner and I have been searching for everything out there and sort of have it narrowed down to to a few choices. Question is what is a standard swing zone safety area. Everyone states 6 foot on each side, but this is a hair too big. We figure your average swing has a full radius of 6 foot. This is 12 foot for the swing zone. How tight can we push the area before it becomes a hazard. Can you safely fit this into a 20' area without a real concern? 18 foot? Thanks for any suggestions.