Hey, man! What a well written instructional post! I really enjoyed reading all the details and I appreciate the heavy research you did for this. It's an interesting proposition, using the Watt as a unit of account. I imagine it's not easy to implement though, what with the differing prices for each country, but it's definitely a good measure. I do hope more eyes gets to read this and that this idea would gain more traction!
RE: Bitcoin's Unit of Account: The Watt-Hour