I love this bike! I have built several bikes using alternative materials, mainly hardwood and bamboo. I prefer the workability and look of carbon fiber over hemp for my lugs. Some people say hemp is more forgiving in regards to temperature expansion/contraction than carbon fiber as the bamboo and hemp do so at similar rates. I have no personal experience with any of that trouble. My question to you is where did you source the carbon seat stays and chain stays? They look very similar to what is on my Sette Durata, an Aluminum/Carbon hybrid frame. Did you use an existing frame, or did you find them on a frame builder supply site?