Hello there, just a note to say how useful we have found the site at Playground Ideas as we have been working through concepts for the Pandavgad Community Play Area.
There are open source designs which are low cost, safe and sustainable. Well worth checking it if you have landed here looking for playground information. They also have handy how to guides on everything to with the design and build as well as arguments for the importance of play.
Here is our listing on their website: