First I have got to say, thats got to be one of the coolest home improvements I have ever seen haha. Seriously badass. If you managed to solar heat that and use windpower for anyting else that would be rediculous. Amazing.
Second, I beleive it is quite simple to use a wind generator to power a car battery. It essentially acts as a trickle charger for a car battery. If you managed to find everything you want to use in a 12 volt application it would work pretty simply and efficently. To move some water you could use a 12volt boat bildge pump. They are not too expensive. You could pipe the water out and over a waterfall type thing to airate. The bildge would run off a 12 volt battery that would be hooked up to a windmill. If something you are interested I could ask my dad about it, he has made one before. We power a cabin on an island with a system just like this. Battery runs a few light etc. Pretty slick, all done with a homemade windmill. I am sure you could find someway to do a couple things with essentially free power from a windmill. You could light it, heat it, recirculate the water, airate etc.
Again, love your setup, very impressed!