You can use all that stuff but it will cost you a packet to do so, firstly you will have to buy all that gear then get an adaptor plate custom made or from Greddy to adapt the RB26 inlet to the RB25 head. Then have to sort all you Vac lines, harnesses and throttle cable the fit the new system. If you get the std gtr intercooler mts and piping you should be able to make the cooler to Throttle body it ok but have to get the turbo to cooler made.
It is very do able but not worth it, buy a RB26 and bolt it in and away you go. Or just get a intercooler and plenum kit from Plazmaman and get an injector upgrade kit from Injectors online, they have kits to change your injectors to top feed. There links are below.
http://www.injectorsonline.com/
http://plazmaman.com/
Good luck,
Ryan