Build Swingset online Features

I have been looking at a few sites that have this cool feature where you can literally build your own swing set. I was trying this one at http://www.kidscreations.com/pages/Design-Your-Own.html
It seems to work ok.. Has anyone ever used this? How do they know if each accessory or add on is safe for play? Ie. what if I add a trapeze bar close to monkey bars.

No matter what type of swing set you get, it more than likely is going to be some sort of kit, that doesn't require any special tools or skills. My husband built one similar to these in an afternoon. Just make sure it's on flat ground.