The roll-over hoops are made of UHMW and have been really reliable; because they are quite springy, they also provide some shock protection when the bot lands upside down. The front one was cut in half by a vertical saw bot but that is the only real damage they have ever taken.

You would probably need a greenhouse to grow bamboo in Birmingham but as some species grows at up to a metre per day, you could have a frame is about a week.