Excellent write up/info. As always, the more pictures the better.
I just need the motivation for something like this. I imagine the output is excellent in the housings.
I found this on their forum, but it doesn't really answer if you can have it completely disabled. They have it listed as an option. So I would ASSUME you could have them just disable it.
http://www.greendieselengineering.com/jforum/posts/list/174.page
Nicely done on the block heater cord... I've never really thought about doing it like that.
Here in TN, we really don't have COLD COLD weather so one is not really needed on ours.