I tried talking him out of it, with this frame at least. I had a feeling the chain stays might flex/snap after a certain amount of force/torque was applied to them, and tried explaining that to him. And I don't want to go ahead and convert it even if this guy says "yes I'll use brakes..." because I know he's not going to haha. I tried telling him about steel and aluminum frames snapping, about having to use an eccentric bb or hub, and the other downsides of this frame, but he just really wasn't listening to me. Which is why I was trying to find a safe way, or maybe someone had a success story, so I could go ahead with it. But I just really don't think this is a good idea considering the style of riding he's looking to do.