you will have to use the gt-t AAC valve, as the gt-t uses 2 plugs on it but the gtr only uses one.
GTR injectors and rail is easy, you just wire in the std gtr resister pack, and gtr injectors are cheaper than gt-t injectors.
i am running a hks oil cooler but i still found that the vacuum box that is bolted onto the under side of the gtr plenum would not fit, so i fab up my own mine and hook up all the vacuum hoses that were needed into it
Also looks like you use the GTR water outlet on the plenum the other option you could have gone was to cut off the gt-t water outlet and weld that onto the gtr plenum. then the angle would not have been so bad but looks like it will still work.