Looks ok what you have, I too have started a model in Autodesk Inventor. FWIW that crappy Honda drawing has given me nothing but problems with a goal on any kind of dimensional precision. What program are you using and have you verified any of the dimensions/angles/radii? I initially scaled those Honda drawings using a frame tube of known size but most of the drawing was out by alot. Rear end area by a couple of inches IIRC. Probably will get back on it soon but I keep wondering if that drawing is any sound base to create a reasonably precise model out of...It'd be easier to take a 3D scan of an actual living frame and proceed from there.