im in the middle of the vh swap as well. i put 240sx rear irs in i would choose it over the q45 rear end becasue its a couple inches narower. but the 240 sx width is still a couple inches wider than stock Z. i think the only way to get the front of the q45 in to a z would be to widen the frame rails by about 6 inches(thats jsut a guess ive neverbothered to mesure) and to make the upper control arms of the Q45 work properly you would have to add some frame rails and to do that you would then have to widen the strut towers. its almost seams like it would be easyer to cut the whole front of the Q off and weld it on the fire wall of the z and then tapcon the fenders back on. it seams like alot of weight. if you were to put the Q suspension the one thing to consider is roll centers and to match them properly sub frame to subframe. its one thing getting them in there. but another getting them to work right. my personal opinion is keep front end of the Z car -Z car to do the mods evin if you did them very right you would still end up with something that lookes very frankenstien .
(BTW. the cats stay on and the engine comes out the bottom tranny and all. should take about 4.5 hours) take alook at my members photo page to see how i did the rear end. if i were to do it again i would chang a couple things but thats another story .
Jonny...