I posted this over on my project thread, but figured I'd share it on the main forum in-case anyone finds it useful.
Through a combination of 3D scanning with my phone and hand measurement, I made a "quick" model of my CB500 frame, as none appear to exist online.
The model omits some details entirely (eg. smaller brackets, center stand mounts, side cover tabs, etc), and I kind of phoned it in on some of the details to simplify modeling (especially towards the rear hoop and at the various tube interfaces), but it's reasonably accurate - certainly accurate enough to design body work around which was my intended use.
I'm providing the model for others enjoyment, but use at your own risk and verify dimensions for yourself
Here's a link to the 3D model viewable online:
CB500F Frame ModelAnd also a link for the model in stl, stp and sldprt formats, as well as a dxf of the drawing shown above:
CB500F Frame CADEnjoy!