@ kevin,
thanks haha. Nsx spoiler with some nicely shaped mounts did the trick :P.
@blue,
I actually did get a different offset, 2.5W all around. This would guarantee me the same width all around (obviously). But in terms of height, I compared a stock altezza to the Time-Attack HKS one, and noticed how theres a significant height adjustment. If you've noticed with JGTC cars, typically they'd cut the top half of the car and custom fabricate the lower half. even the wheel wells reach higher than the engine height. I did also make a new front clip and reglued side clips to keep it mounted.
Here's what I mean - you can see the ride height is pretty crazy.