Or if you don't mind it the factory top hats come right off the rear struts and then all you have to do is pop the rubber insulation donuts from the coil over kit onto that plate and the whole Z32 suspension goes right back into a Q.
My Q is on a set of megan EZ Street Z32 coil overs. 94+ cars require a machinist to bore out the front strut lower mount collar that's made of copper. It took like 5 minutes by my machinist to do and I have no access to other uprights so I did that. There is plenty of shock absorbing rubber and copper left afterwards anyway.
for some reason the front strut of a Z32 is almost fully extended to full length (on the shock itself, as megan allows full length adjustability) to attain that stance. Which means if you want any higher you will have to look for a longer sleeve. I can certainly go lower than that but the roads in my area are not very forgiving and my Q is my dd.

EZ Street here - 16 levels of adjustments

or their sport ones here - 32 levels of adjustments. rumor has it these are just the same OE manufacturer as Trust/Greddy coil overs.
the really short ones are the fronts for a Z32....
then there is the S14 route, which involves replacing the whole front end knuckle to convert the Q from the double wishbone (or what you call it, the top control arm is a wide I bone?) to a macpherson Strut setup.

see how the front strut is expecting a 2-bolt type macpherson knuckle in the bottom on the S14 front coil overs.
the advantage is that you can go really low with this without binding (the factory upper I arm does not allow travel all the way to the top so your setup with the factory upright will not be allowing you to go as low as you might have hoped), but the down side is that you need to source more 240SX bits to make this work. I don't know if the top hats interchange either.
here is a video of a Q45 with S14 front suspension swapped in with a 5 speed
http://www.youtube.com/watch?feature=pl ... YGw#t=327s