...As to programming complexity, it's very simple... this all aims at classical physics simulation in a simple but efficient way. The numeric stuff really just illustrate the use of a real little physics-engine aimed at articulated body simulation... that's the funnest part of it: but of course much more is coming. Also some examples in Game Maker and Matlab/Octave are coming soon.
link to Part 1 of the video where all method is thoroughly exmplained:
http://youtu.be/ELD0WPOxNb0
http://youtu.be/Kjhkyq-pLLw
the part_2 shall explain numeric stuff, and some support for collisions and serious rigid bodies jointed.