That's a little hard to answer. The mod has all the basic building blocks. How much additional is code needed depends on the complexity of the simulation. A simulation with ropes, pivots and moving parts takes more work than one without.
Sure. What I wanted to say: sometimes (well, most times) I have to tweak or encapsulate code to make it work "naturally" (in my eyes). E.g. I dislike the way MaxGUI is intended to be used, so I wrapped it with some OOP code. This is just one reason why buying source is so valuable. That's a major bonus of BMax and it could be a major feature of your module.
Jake