I was contracted a couple years ago to build a natural playground locally - but about halfway through the project - the management decided to do something different so we parted ways. Part of this playground was a small rock climbing wall. I got as far as building the walls and that was all. I still have the 'rocks' that I was going to attach to the wall. It was only going to be 8' tall but since this was for kids it would have been OK I think.
I think management got cold feet about liability to tell you the truth.
Here's a pic I took during construction. I picked up that section of culvert from the local landfill. The original spec was for something 3' high and I decided to get something taller so the adults could use it too!
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Those tires were just placed there so they wouldn't be in the way while we used the track machine. I painted them off site and thought they would jazz things up for the kids. Then management told me they wanted the tires to be plain so everything would (theoretically) blend into the natural background. I disagreed with this philosophy but in the end it didn't matter.
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These are the rocks I was going to use:
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I even built a little clay model of the playground just like architects build scaled down models of their designs. I never did one before and was excited. Oh well....