If this is the Z/G kit, here's some info. I think most of your questions are answered in there. Even if these are different, most of this info would hold true I'd think. http://www.meganracing.com/products/product_detail.asp?prodid=437&catid=93Alignment is dependant on suspension geometry, the fx will negative camber in the rear when lowered a lot, nothing with a coilover kit is going to change that.
Far as these megan racing coilovers,is the front strut housings aluminum or steel? Are they adjustable on rebound and compression? Do you know the spring rate used in the front?
mines look like that and i got the h and r