Working to perfect the miters. The head tube outside diameter is 36.5mm, since they don't make a 36.5mm hole saw you have to use either a 1-1/2 (38.1mm), or a 1-3/8 (35mm) hole saw. I chose the 35mm then filed the sides wide so to speak. The seatube end is done, and now I just have to setup my jig for the sloping top tube. I think now I'm going to get some real traction and start moving ahead on this project. About time right?