That's taken me days! I'm working at home so I've sat down for a break every now and again and read a bit...
Great project - mad that it's been going so long now.
There were so many things I wanted to add, but had to keep reading to see if someone else had thought of it!!
I'll keep an eye on this thread as I really want to see how you get on with the windmill project. I think with wind and solar, you're definetly on the road to having free heating all year round for this.
I was going to suggest something very similar to your roof radiator, but you got it done before I could finish reading the thread - LoL!
All the best
G