That really sucks. Sorry man.
What are you doing with the control arms? You may neeb to be careful as engineers don't like welding or modifying any part of the suspension. ( lucky to even get welded coilovers passed)
Also with the pintara diff, its only 25 spline axels. A bit smaller than the 28 spline skyline variant. If your looking at more power in the future. (150-170kw + atw) you may need to upgrade axel size to the 28 splines. Also check if they fit into your pintara housing. They just might with new bearings.