Awesome yar! Unfortunately, I'm the only one in my neighborhood, as its more of a hobby! HAve you seen the solar lit park in Rawalpindi on peshawar road? It was built by the head of the solar engineering dept at EME was a professor of mine. Sometimes these little ideas work wonders! I met this one guy who installed this impounding reservoir system on top of his house, which works mechanically and whatever water is used to flush the toilet comes from rain water.
Oh wow, haven't visited that park yet, but would love to!
As for rain water, in many countries of the world it is considered a crime to waste it. And per law citizens are required to store this in a standardized way. It is good to know that some Paks have started to realize its value as well.
One question, do you know some private companies in Pak who are selling/installing solar systems?