Great article, which should answer most of your questions dbolt72. All you need to understand is that from your muscle’s point of view there’s no difference between a load you put on them by leveraging bodyweight or a load you put on them by lifting or pressing a barbell. Work is work, contraction is contraction. The same principles of overload and progression apply, and so the same strategies of rep/set volume also apply. And as important as it is for building mass by iron, the right diet is just as important for building mass by bodyweight.