kelly submitting project pitch

This is cool! I imagine such a tutorial would require a good deal of custom code; I wonder if it would make sense to package it up into a reusable package that you could put on PyPI, or to get it merged into Vincent. I'm sure I haven't thought about it as much as you - what do you think it will take? How general an approach do you think will be possible? Will it depend tightly on the map in question?