Laurent Huille sends in this intriguing build. I had a build like this in mind a few years back when one almost fell into my lap.  I would have gone in a different direction with the exhaust and headlight I think but this shows that it could have worked.

Hello,
I’m a French biker
This 1979 XLS 500 is my second “self custom bike” (pardon pour mon anglais approximatif!)
Have a good day!

A before and after pic.