No. Sorry, but it sounds like an interesting project. Sounds like it could be pretty complicated (Basic ramps wouldn't be so bad, but curved banks etc. could be a lot of work--or should I say fun :) ...). Look forward to reading the responses you get.
There are some websites that offer free plan for building ramps. I wanted to build a quarter pipe and a lauch ramp but never bought the wood, nor had the time. (Ramps for bikes and blades) Now that I read your message, it makes me want to build one. I knew some people who could barely operate a circular saw, much less build a ramp, yet they built a couple good ones. I was suprised. It must not be too hard. The only thing that might be hard, would be bending the wood and getting the correct curve and shape. Also, it needs good strength and support. I have the plans and if I build it, I will let you know. Until then, try it yourself and let me know how you did. Later,