Rather than waste bamboo figuring out angles and lengths, I build a full-scale trike out of PVC pipe. I had purchased the bamboo in 1 1/2" and 2" diameters so I used the same size PVC. Very cheap and you can make a lot of mistakes. This proved to be very helpful later on as I could simply cut my bamboo pieces to match the PVC and eliminate errors. It also taught me that I needed a method for maintaining the plane in which the PVC was cut. I'll show how that works in the next step.