Finally got around to doing this conversion today, and i must say definatley worth it! stops so much better now!
Went together fairly easy, only had to trim the rear backing plate due to it hitting the caliper, but no disc interference front or rear.
I went with R34 GT-T setup, ended up using R33 GTR front brake lines, and GKTECH braided rears, fronts fitted perfectly, rears needed slight tweaking from the chassis hard line connector to braided line, and id like to secure it a bit better than what it is so i may need to have a closer look as to how the rears are supported in a R33/R34.
Used Brand New RDA slotted rotors to suit R34 GT-T and TRW pads all round, and the stopping power it awesome now!
Definatley worth the effort for this upgrade!