1 - Mehmood directed you to the right path.Although the info is scattered over there but it's available.
2 - Haven't seen it done.but i'm quite interested in putting civic 2005 mete in my car as well.unfortunately,the housing it totally different.
3 - i heard they are available at some shop in karachi.donno the price.U could order a custom made from any fiber wala.
4 - Winters Zic A+ ,summers Zic A.
5 - There is a thread going on here about an ac wala near I&T centre.ppl says he's gud.Try searching for the thread.
I think ZIC XQ would be waste of money.or should i say not value of the money spent.