Are there standards or best practices yet when it comes to multi table inheritance in rails 3? So far the best article I could find was:
http://mediumexposure.com/mu
I recently forked a promising gem to implement multiple table inheritance and class inheritance in Rails. I have spent a few days subjecting it to rapid development, fixes, commenting and documentation and have re-released it as CITIER (Class Inheritance and Table Inheritance Embeddings for Rails).
Consider giving it a look: https://github.com/PeterHamilton/citier
It actually takes some concepts from that article you mention.