In 2010 I worked with a project where we created a complete line of prefabricated concrete ramps. We worked closely with professional skaters as well as good amateurs to find the right angles, dimensions and radiuses. Other aspects we had to consider when designing was how to move these very heavy parts (a standard half-pipe weights 27 tons) to the skate parks. I worked with both designing and 3D-modelling as well as illustrations.
For more info (in swedish), visit:www.finja.se/finjaskate