Here is what I am going to guess, Champion frame and swingarm, rear wheel brakes look like a Maico set up, front looks like a Bultaco conical hub but also could be Maico, forks look like they have to be Betors or Cherrianis. Rims are Akront shouldered type, whic IMHO are the strongest best looking rims ever....but they pack up with mud. Tank is some fibreglass aftermarket deal probably Champion too. I don't remember that particular pipe but am sure it is all outlined in the article.
" The people who cast the votes decide nothing. The people who count the votes decide everything."
Straight Out Da Trailah!