I see a spoiler in one picture, but not the others. Hopefully you are planning to add something similar. In my opinion (and that is all it is, my OPINION) the fastback needs a Wangan style wing to attempt to "square off" the rear end. The stock rear end is too rounded to flow with the very blocky Silvia Aero front you are using.
Looks to be a very clean job thus far though.
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