would a 42 mm offset be high enough?

Also i was planning on getting a full spider style body kit, with a 1.9f/1.7r drop would this be a problem?

 

42 should be but id get a camber kit for the back, i didnt need it for the front with the drop from s-techs. but you can adjust them in enough that it will not affect your allignment if your tow is right. mine are set in aboutone degree. but i still had to roll the fender lips in, but only the back the fronts fit great. the ride is great too. im not sure about the bodykit. id ask who ever your getting it from about that and maybe a body tech. ill get some pics up soon to show everyone.

 

i have 17's with a 40 offset and they tuck perfectly with no rub, so a 42 will fit fine without any fender rolling. as for the body kit, you may have some minor scraping problems with speed bumps and steep incline transitions.