The Spin Torus Energy Model (STEM) is an energy-centric approach that is based upon the hypothesis there is only one type of energy, with electric and magnetic fields consisting of the same type of field-energy, but with different field-energy flow patterns.
STEM is a personal theory that been developed ad hoc over the past six years. Rather than trying to fit the physical model to a mathematical model and interpretation of data, the model has been developed and re-jigged on the basis of what it can and cannot explain: what I refer to as a pragmatic approach. Testing of the theory and underpinning hypothesis is thus in terms of how completely and logically it can explain known Physics and Chemistry related phenomena.
All three papers are inter-related and inter-dependent. It is a bit of a chicken and the egg problem to decide with which to start. I would suspect that most LENR participants would be most comfortable starting with the atomic structure paper, but might need to look at the electron paper (the Duplicit Electron) to find out more about how electromagnetic fields are envisaged and the difference between positive and negative charge carriers.
The third paper, about the physical form and behaviour of the many types of EMR forms would probably be tackled further down the track.
A skeletal overview and flowchart of STEM can be found in the STEM Overview pdf: it also contains direct links to the three papers referenced above.
I have made several posts in Frank Gordon's "Lattice Energy Converter (LEC)" in the replications workshop that was related to ortho- and para-hydrogen explanations. Much of this suggested approach was based around pages 23 to 26 in the atomic structure paper, together with the explanation of why palladium can absorb up to 900% of its volume of H2 (or D) gas being found on page 62 in the ‘And Beyond Silicon..’ chapter.