My next bamboo project:
It's going to be an upright tourer.
To stiffen the frame I lined the interior of the main triangle with carbon cloth, using a thin bike tube as a bladder. I'm going to cut the head tube after I start the lugs, which is what I'm working on now. They will be hemp fiber, same as my last frame.
I used the Surly Long Haul Trucker and Rivendells as a reference for the geometry.
72º HT, 72.5º ST, 23" TT, 32" SO, 3" BB Drop, 19" CS (to be able to accommodate a larger tire and I'm going to mount a frame pump behind the seat tube).