When I started this build thread I stated there were no other bikes to compare to or glean ideas and information about the bikes beyond just welding on a hardtail. Over the holidays I googled KZ400 Chopper & KZ400 Bobber. Holy macaroni! There must be hundreds of these bikes out there with the VooDoo Vintage hardtails. At any rate, I was satisfied that no one else is approaching their project quite like I am. Notably, the pic you posted appears to be running a single rear brake system from the front brake lever. These bikes never had a rear disc and also note there is no rear brake pedal or front brake. Really anxious to get the critical parts so I continue the fabrication part of this build.