ARC skateable obstacle

My entry to the competition Long story short: Advantages: - Lots of tricks can be performed - Simultaneous parallel performance of two skaters (Due to antisymmetry of the structure it is possible to make competitions with route on each side) - Simple to manufacture Manufacturing points: - Structure includes 2 pipes (2 inch sch 40), Each pipe consists of 3 sections, each section is the simple flat radius bend. - Other is either concrete covered with composite (In this case mould for concrete is profiled with the same tubes), or metal support structure (in this case frame is made with the same sectional flat radius bend as pipe)