If you think of explicit parkour obstacles your gonna come up with rails and walls, thats it and frankly you can find that anywhere, if your gonna try to expand to avoid that and have moveable convertable obstacles your gonna have a gym, again nothing new. Try to take inspiration from your own favorite hotspots, look at mundate architecture that happens to be great for parkour although not intended to be, picture the perfect pk heaven type of architecture, in other words, something thats a little different, something thats not just the ideal environment for specific moves. What I mean by this is instead of envisioning something thats easy to use and holds no extra variables, try to create something thats an obstacle, that will require creative pk problem solving to traverse. Take for example, the Dame du Lac (that giant tan fin shaped thing in France that David Belle and them folks are always jumping on in footage. It's not a typical shape or style but it can be used for some of the greastest parkour because it is different and inspires creativity. It's this principle that always makes public art pieces throughout cities so good for parkour, they're different.
In fact, just look at the rest of the park, for skateboarding, its filled with odd shapes like funboxes and stairs with rails sticking out of them, all stuff that can be used creatively in all sorts of different ways.
Just something to think about, oh and let me just say, this is really awsome, what you've got going, I mean if this pulls through you'll be doing something totally revolutionary. It's been talked about alot, but I've never heard of it actually being put into effect.
