For drift you probably want slide so no point in changing roll centres. IF you want it to handle though and get power down changing rear squat angle helps a lot, plus other things.
Re your build I like your rear tailgate and rear wing.
A few things I noticed after looking through all 8 pages hear. I will mention some things that may help, being the following.
Easier to remove sound deadening with dry ice, and does a better job.
Brake lines don't look like fully supported and may rub through.
I see factory wires which if race car not needed and can delete most of this to save weight.
No ABS, next step is peddle box which I found a huge improvement in brake feel, although a big job.
Nismo don't make strut braces for Zeds.
Fan shroud missing and works much better with one?
You might find you will need support under tailgate for that rear wing? IF doing high speed circuit.
Brakes are not motorsport type and will probably get knock off with big rotors and better to convert to floating hats.
The top front control arms will bind and come lose.